Concepts

A sales commission is a percentage of the total amount of sales.

Tips and taxes are percentages of the original price that are then added to the original price.

Coupons are amounts of money that are subtracted from the original price.

Sales are percentages of the original price that are then subtracted from the original price.

Rules

Sales discount: (% sale converted to a decimal × original price)

Sale price = original price – sales discount

Discounted price = sale price - coupon 

Tax = (% tax converted to decimal × discounted price)

Sales Commission = (percentage converted to a decimal) × total amount of sales

Final Cost = Original price –sales discount - coupon discount + sales tax + tip

Sales price = Original price - (% sale discount converted to a decimal × original price) 

Note: If there is more than one tip, tax, coupon, or sale, each must be calculated one at a time. 

Example

A dress was originally priced at $105.00. Corey had a coupon for 10% off and a $5 off coupon. 

How much did she save?

Solution

(original price × percent coupon) + money off

($105 × 10%) + $5

(105 × 0.10) + 5

10.5 + 5

15.5

$15.50

Pre-requisite Skills

Calculate percent of quantities (6.8.4)

Finding Percent of Change (7.2.5)

Sales Tax, Tips & Markups (7.2.6)