Question

Lesson 3.7: Simple Interest

Warm-Up Active
Finding Percents
Match each percent problem with the correct dollar amount.
25% of $50
5% of $30
10% of $45
30% of $40
I
t
t
$1.50
$4.50
$12.00
$12.50

Answer 1

• $12.50
• $1.50
• $4.50
• $12.00

Explanation:

In the context of this problem, ...

• % means /100
• "of" means "times

Application

a) 25% of $50 = 25/100 × $50 = $12.50

b) 5% of $30 = 5/100 × $30 = $1.50

c) 10% of $45 = 10/100 × $45 = $4.50

d) 30% of $40 = 30/100 × $40 = $12.00

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Additional comment

Many calculators and all spreadsheets can work with percentages directly, without the need to convert them to a fraction or a decimal.