Practice Quiz

SAT Math

Category - Number and Operations

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Olivia wanted to buy shoes priced at $90. In the meantime the price increased by 10%, and after a while decreased by 10%. What is the price of the shoes now?
  1. $90
  2. $99
  3. $81
  4. $89.10
  5. $90.90
Explanation
Answer: D - The price of the shoes now is $89.10. First calculate 10% of $90.
10%×90 = 10/100×90 = 900/100 = 9

The new price is $90 + $9 = $99.

Now calculate 10% of $99.
10%×99 = 10/100×99 = 990/100 = 9.9

The new price is $99 - $9.9 = $89.10, which is the current price.
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