Page 505 - Basic College Mathematics with Early Integers

482 C HAPTE R 6 I PERCENT

SOLD
HOME
FOR SALE

Her commission on the house is $3210.

Work Practice 3

PRACTICE 4 Example 4 Finding a Commission Rate
A salesperson earns $645
A salesperson earned $1560 for selling $13,000 worth of electronics equipment.
for selling $4300 worth of
Find the commission rate.
appliances. Find the
commission rate. Solution: Let r stand for the unknown commission rate.Then
commission = commission rate # sales

T T T
$1560 = r # $13,000
1560
= r Divide 1560 by 13,000, the number multiplied by r.
13,000
0.12 = r Simplify.
12% = r Write 0.12 as a percent.

The commission rate is 12%.

Work Practice 4

Objective Calculating Discount and Sale Price

Suppose that an item that normally sells for $40 is on sale for 25% off. This means
that the original price of $40 is reduced, or discounted, by 25% of $40, or $10. The
discount rate is 25%, the amount of discount is $10, and the sale price is $40 - $10,
or $30. Study the diagram below to visualize these terms.
Discount
rate

$10 25% of $40 $10

Original Sale original amount of
price: price price discount
$40 $30
$30 $40 $10
Copyright 2012 Pearson Education, Inc.
To calculate discounts and sale prices, we can use the following equations:

Discount and Sale Price
#
amount of discount = discount rate original price
Answer
sale price = original price - amount of discount
4. 15%