Exercise 45 Page 131

It does not matter which we calculate first, the tax or the discount.

$ 101.76

Practice makes perfect

Note that it does not matter which we calculate first, the tax or the discount. We will begin by adding the tax to the original price. Then we will subtract the discount.

Adding the Tax

To calculate the tax on the lamp, we can multiply $120 by 6 % in its decimal form.

$120* 6 %

WriteDec

Write as a decimal

$120* 0.06

UseCalc

Use a calculator

$7.20

If we add $7.20 to the original price, we get the price including tax. 120+7.20=$ 127.20

Subtracting the Discount

Now that we know the price including tax, we can calculate the discount by multiplying this price by 20 % in decimal form.

$127.20* 20 %

WriteDec

Write as a decimal

$127.20 * 0.2

UseCalc

Use a calculator

$25.44

When $25.44 is subtracted from $127.20, we get the discounted price including tax. 127.20-25.44= $ 101.76

Subchapter links

Check Your Understanding p.128

Practice and Problem Solving p.129-130

H.O.T. Problems p.130

Standardized Test Practice p.131

Spiral Review p.131

Skills Review p.131

Exercise 45 Page 131

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Adding the Tax

Subtracting the Discount