Percent Review

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 to find the original price after a discount?

Back

Original Price = Sale Price / (1 - Discount Rate). For example, if the sale price is $127.46 after a 15% discount, the original price is $127.46 / (1 - 0.15) = $149.95.

Front

How do you find the percent error?

Back

Percent Error = |(Estimated Value - Actual Value)| / Actual Value * 100%. For example, if the estimated value is 350 and the actual value is 210, Percent Error = |(350 - 210)| / 210 * 100% = 66.67%.

Front

What is the formula for simple interest?

Back

Simple Interest = Principal x Rate x Time. For example, if you borrow $6500 at an 8% interest rate for 5 years, the interest is $6500 * 0.08 * 5 = $2600.

Front

What does it mean if 64 is 40% of a number?

Back

It means that 64 is 40% of the total number. To find the total number, use the formula: Total Number = Part / Percent. Here, Total Number = 64 / 0.40 = 160.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide by 100. For example, 25% as a decimal is 25 / 100 = 0.25.

Front

What is the relationship between fractions and percentages?

Back

Fractions can be converted to percentages by multiplying by 100. For example, 1/4 = 0.25 = 25%.

Front

How do you find the sale price after a discount?

Back

Sale Price = Original Price x (1 - Discount Rate). For example, if the original price is $100 and the discount is 20%, Sale Price = $100 x (1 - 0.20) = $80.

Front

What is a markup?

Back

Markup is the amount added to the cost price of goods to cover overhead and profit. It is often expressed as a percentage of the cost price.