Practice Quiz

IB Mathematics SL Prep

Category - IB Mathematics

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A department store sells sweaters for $90. During a promotion, the sweaters are marked down 15%. What is the sale price of the sweaters?
  1. $75.00
  2. $76.50
  3. $77.67
  4. $78.14
  5. $76.02
Explanation
Answer: B - $90 marked down 15% is $76.50.

Key Takeaway: To find 15% of a 2-digit number, follow these steps:

First, multiply the number by 3 (90 x 3 = 270).

Then, divide that answer by 2 (270/2 = 135).

Move the decimal point in the resulting number one place to the left (135 becomes 13.5).

The amount of the discount in this problem is $13.50, so the sale price is $76.50.
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