Percent increase and decrease

Percent increase is the amount that a value has grown, expressed as a percentage of the original value.

Percent decrease is the amount that a value has fallen, expressed as a percentage of the original value.

Percent increase = ((New Value - Original Value) / Original Value) x 100.

Percent decrease = ((Original Value - New Value) / Original Value) x 100.

Markup is the amount added to the cost price of goods to cover overhead and profit.

A discount is a reduction in the price of a product or service.

New Price = $20 + ($20 x 0.25) = $25.

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

0.15

Tip = $30 x 0.15 = $4.50.