7th Ch 2 Percents

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 calculating the final price after tax?

Back

Final Price = Original Price + (Original Price * Sales Tax Rate).

Front

If a store marks up an item by a certain percentage, how do you find the selling price?

Back

Selling Price = Cost Price + (Cost Price * Mark-up Percentage).

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 original price before tax if you know the final price and tax rate?

Back

Original Price = Final Price / (1 + Sales Tax Rate).

Front

What does it mean to tip a percentage of a bill?

Back

Tipping a percentage means calculating a portion of the total bill amount to give as a tip. For example, a 15% tip on a $20 bill is $3.

Front

How do you set up a proportion to find a percentage?

Back

To set up a proportion, use the formula: part/whole = percent/100.

Front

What is the formula for calculating the percentage increase?

Back

Percentage Increase = ((New Value - Original Value) / Original Value) * 100.

Front

What is the formula for calculating the percentage decrease?

Back

Percentage Decrease = ((Original Value - New Value) / Original Value) * 100.