Percent Increase and Decrease

Percent increase is the amount that a value has grown, expressed as a percentage of the original value. It is calculated using the formula: ((New Value - Original Value) / Original Value) x 100.

Percent decrease is the amount that a value has decreased, expressed as a percentage of the original value. It is calculated using the formula: ((Original Value - New Value) / Original Value) x 100.

To calculate the sale price after a discount, subtract the discount amount from the original price. Formula: Sale Price = Original Price - (Original Price x Discount Percentage).

The discount amount is $3.68, calculated as $24.50 x 0.15.

Total Price = Original Price + (Original Price x Sales Tax Rate).

She earned $324 in September, calculated as $300 + ($300 x 0.08).

Marking up a price means increasing the original price of an item by a certain percentage to determine the selling price.

The selling price is $5.53, calculated as $4.25 + ($4.25 x 0.30).

To calculate a tip, multiply the total bill by the tip percentage. Formula: Tip = Total Bill x Tip Percentage.

You should tip $6.28, calculated as $27.31 x 0.23.