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401(k) Balance
Determines your 401(k) balance given a salary history per year, contribution percentage rate, employer match percentage, and a rate of return.

Binomial Option Pricing Model
This shows all 2t scenarios for a stock option price on a binomial tree using (u) as an uptick percentage and (d) as a downtick percentage

Confidence Interval of a Proportion
Given N, n, and a confidence percentage, this will calculate the estimation of confidence interval for the population proportion π including the margin of error

Coupon Comparison
Given a cost of goods, a dollar off coupon, and a percentage off coupon, this calculator will compare the two deals and determine which one is of more value. If the dollar coupon wins, the calculator will project the break even price where the dollar coupon would surpass the percentage coupon

Credit Card Balance
This calculator shows 3 methods for paying off a credit card balance on a monthly installment basis given an outstanding balance and an Annual Percentage Rate (APR):

1) Minimum Payment Amount
2) Minimum Percentage Amount
3) Payoff in Years

Heat Index
Given a temperature in Fahrenheit and a relative humidity percentage, this calculates the Heat Index.

Given a time series of actual and forecasted values, this determines the following:
* Mean Absolute Percentage Error (MAPE) also known as the Mean Absolute Percentage Deviation (MAPD)
* Symmetric Mean Absolute Percentage Error (sMAPE)
* Mean Absolute Percentage Error (MPE)

Markup Markdown
Given the 3 items of a markup word problem, cost, markup percentage, and sale price, this solves for any one of the three given two of the items.

P-Hat Confidence Interval
Given a large sized distribution, and a success amount for a certain criteria x, and a confidence percentage, this will calculate the confidence interval for that criteria.

Percentage of Completion
Given a sales price, total costs, and costs per period, this determines the gross profit to date using the percentage of completion method.

Percentage of the Pie Word Problem
This takes two or three fractions of ownership in some good or object, and figures out what remaining fraction is left over.

Percentage-Decimal-Fraction Relations
Calculates the relational items between a fraction, a decimal (including repeating decimal and terminating decimal), a percentage, and the numerator and denominator piece of that fraction. Also calculates the percentage change going from one number to another or the amount increase or decrease of a percentage above/below a number. Round decimals.

Proportion Sample Size
This calculator determines a sample size to select to meet certain criteria related to a confidence percentage, reliability percentage, and a p value proportion. Simply enter your values not using percentage signs. This works whether p^ is known or not known.

Rebound Ratio
Calculates a total downward distance traveled given an initial height of a drop and a rebound ratio percentage

Resistor Color Codes
Given 3 Band level color codes and a tolerance color chosen, this calculates the resistance in ohms and the tolerance percentage

Sales Tax
Given a sales price and a total bill, this calculates the sales tax amount and sales tax percentage

Sample Size Reliability for μ
Given a population standard deviation σ, a reliability (confidence) value or percentage, and a variation, this will calculate the sample size necessary to make that test valid.

Sample Size Requirement for the Difference of Means
Given a population standard deviation 1 of σ1, a population standard deviation 2 of σ2 a reliability (confidence) value or percentage, and a variation, this will calculate the sample size necessary to make that test valid.

Solution Mixture
Determines a necessary amount of a Solution given two solution percentages and 1 solution amount.

Trimmed Mean and Winsorized Mean
Given a number set and a trimmed mean percentage, this will calculate the trimmed mean (truncated mean) or winsorized mean.

Vendor Discount Effective Rate of Interest
Calculates the effective rate of interest earned from a vendor discount for a prepayment of a balance within a certain amount of days for a percentage discount

15 out of 18 students agreed. What percentage did not?
A piece of gym equipment which cost 450 including vat last year is now selling at 500 excluding vat.
Carol gets 5 each week for allowance. She saves 1 of her allowance. What percent of her allowance do
$6500 is 7/10 of a number. What is the number
David obtained 5 out of 20 votes in the election. What percentage of the votes did david receive?
students at East Central High School earned $384 selling car washes. They want to make $2690 for a c
In order to select new board members, the French club held an election. 63 out of the 90 members of
You borrowed $25 from your friend. You paid him back in full after 6 months. He charged $2 for inter
Facebook provides a variety of statistics on its Web site that detail the growth and popularity of t
Six Years ago, 12.2% of registered births were to teenage mothers. A sociologist believes that the
The first significant digit in any number must be 1, 2, 3, 4, 5, 6, 7, 8, or 9. It was discovered t
A random sample of 25 customers was chosen in CCP MiniMart between 3:00 and 4:00 PM on a Friday afte
The sales tax for an item was $21.50 and it cost $430 before tax. Find the sales tax rate. Write you
Ali spent $60 at the grocery store. Of this amount, he spent $51 on fruit. What percentage of the to
The relief time provided by a standard dose of a popular children’s allergy medicine averages 7.9
Yael worked out at a gym for 2 hours. Her workout consisted of stretching for 21 minutes,jogging for
A recent survey showed that 49% of recent college graduates named flexible hours as their most desir
A recent survey showed that 44% of recent college graduates named flexible hours as their most desir
At what simple interest rate will 4500$ amount to 8000$ in 5 years?
Stephanie and her sister go bowling every weekend and have been keeping track of their wins for the
24 students in a class took an algebra test and 19 of them earned a B or better. What percent of stu
The property taxes on a house were $810. What was the tax rate if the house was valued at $90,000
An item cost $370 before tax, and the sales tax is 25.90 what is the percentage?
On the math test, Ralph answered 17 out of 20 problems. What percent did he get right?
A car is bought for $2400 and sold one year later $1440 find the loss as a percentage of the cost pr
Of the 800 students of a school, 600 have traveled. What percentage of the students went on a trip?
At a certain university, 60% of the students enrolled in a math course, 50% are enrolled in an Engli
If the original price of an item was $30.00 and Joan only paid $24.00 for it, what percentage discou
Need help quickly! My math skills are escaping me!
Need help quickly! My math skills are escaping me!
A 5L juice container has 3.6L of juice left. What percentage has been used?
A woman earns $2400 per month and budgets $480 per month for food. What percent of her monthly incom
In the past year, Yoko watched 76 movies that she thought were very good. She watched 80 movies ove