Percent Problems

Front

What is a percent?

Back

A percent is a ratio expressed as a fraction of 100. It represents a part of a whole.

Front

How do you calculate a percentage of a number?

Back

To calculate a percentage of a number, multiply the number by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.

Front

What is the formula for finding the total when given a percentage and a part?

Back

The formula is: Total = Part / (Percentage in decimal form). For example, if 15 is 30% of a number, Total = 15 / 0.30 = 50.

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the numerator by the denominator and multiply by 100. For example, 1/4 = (1 ÷ 4) * 100 = 25%.

Front

What is simple interest?

Back

Simple interest is calculated on the principal amount only. The formula is: Interest = Principal x Rate x Time.

Front

If a car costs $25,000 and the commission is 18%, how much is the commission?

Back

The commission is $25,000 * 0.18 = $4,500.

Front

What is the percentage of seats sold if 225 out of 250 seats are sold?

Back

Percentage sold = (225 / 250) * 100 = 90%.

Front

How do you find what percent one number is of another?

Back

To find what percent one number is of another, use the formula: (Part / Whole) * 100. For example, (225 / 250) * 100 = 90%.

Front

What is the formula for calculating the percentage increase?

Back

Percentage Increase = [(New Value - Old Value) / Old Value] * 100.

Front

How do you find the original number if you know the percentage and the part?

Back

Use the formula: Original Number = Part / (Percentage in decimal form). For example, if 15 is 30% of a number, Original Number = 15 / 0.30 = 50.