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Big Ideas Math: Modeling Real Life, Grade 7 View details

Chapter Review

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Exercise 28 Page 275

How do you calculate 15 % of $50?

$ 42.50

Practice makes perfect

In order to find the discounted price, we need to subtract the discount in dollars from the original price. Original price- Discount= New priceFirst, we have to find the cost subtracted by the discount, which is 15 % of $50. We can find the value of the discount by multiplying the original price by the discount rate.

$50* 15 %

WriteDec

Write as a decimal

$50* 0.15

UseCalc

Use a calculator

$7.5

Finally, by subtracting $7.5= $7.50 from $50, we get the new price including the discount. $50- $7.50= $ 42.50