Percentage Increase and Decrease

Front

What is a percentage increase?

Back

A percentage increase is a way to express how much a quantity has grown in relation to its original amount, calculated as (new amount - original amount) / original amount x 100%.

Front

What is a percentage decrease?

Back

A percentage decrease is a way to express how much a quantity has shrunk in relation to its original amount, calculated as (original amount - new amount) / original amount x 100%.

Front

How do you calculate 20% of a number?

Back

To calculate 20% of a number, multiply the number by 0.20.

Front

What is the formula for calculating the new amount after a percentage increase?

Back

New Amount = Original Amount + (Percentage Increase x Original Amount) or New Amount = Original Amount x (1 + Percentage Increase).

Front

What is the formula for calculating the new amount after a percentage decrease?

Back

New Amount = Original Amount - (Percentage Decrease x Original Amount) or New Amount = Original Amount x (1 - Percentage Decrease).

Front

If an item costs $100 and is on sale for 20% off, what is the sale price?

Back

Sale Price = $100 - ($100 x 0.20) = $80.

Front

What does a 30% decrease mean in terms of original amount?

Back

A 30% decrease means the new amount is 70% of the original amount.

Front

How do you find the percentage change between two numbers?

Back

Percentage Change = (New Amount - Original Amount) / Original Amount x 100%.

Front

If you have a $50 meal and leave a 15% tip, how much is the tip?

Back

Tip = $50 x 0.15 = $7.50.

Front

What is the difference between absolute change and percentage change?

Back

Absolute change is the actual difference between two values, while percentage change expresses that difference as a fraction of the original value.