[header] How to calculate cost savings percentage [title] Determine the original price of the product or service. [step] For most purchases, this is the retail price before any coupons or discounts are applied. [substeps] For example, if the original, retail price of a sweater is $50, use $50 as your original price. 
For an hourly service, multiply the standard billing rate by the number of hours normally billed. [title] Determine the new price of the product or service.