Module 5- Proportions and Percents

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you calculate a percent of a number?

Back

To calculate a percent of a number, multiply the number by the percent (in decimal form). For example, 25% of 80 is 0.25 * 80 = 20.

Front

What is the formula for percent increase?

Back

Percent Increase = ((New Value - Old Value) / Old Value) * 100.

Front

What does a 20% discount mean?

Back

A 20% discount means you pay 80% of the original price.

Front

How do you find the total cost after tax?

Back

To find the total cost after tax, multiply the original price by (1 + tax rate). For example, for a $100 item with a 5% tax, total cost = 100 * 1.05 = $105.

Front

What is the percent increase from 75 to 120?

Back

Percent Increase = ((120 - 75) / 75) * 100 = 60%.

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 a sales tax?

Back

Sales tax is a percentage added to the price of goods and services, collected by the seller and paid to the government.

Front

How do you calculate the final price after applying a discount and tax?

Back

First, apply the discount to find the sale price, then calculate the tax on the sale price, and finally add the tax to the sale price.

Front

What is the percent decrease?

Back

Percent Decrease = ((Old Value - New Value) / Old Value) * 100.