Practice Quiz

IB Mathematics SL Prep

Category - IB Mathematics

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A video store is offering a 7% discount on previously viewed videos. If the regular price of a video is $9.99, how much will the discount be?
  1. 63 cents
  2. 70 cents
  3. 74 cents
  4. 77 cents
  5. 80 cents
Explanation
Answer: B - 7% of 9.99 is 70 cents.

The regular price is approximately $10, so think about what 1% of that is - 10 cents. 2% would be 20 cents, 3% would be 30 cents, and so on. This is another question we want you to get fast.

Key Takeaway: In this case, the key is to recognize that you are working with a number that can be rounded ($9.99) to something ($10) that is very easy to work with. So get yourself in the habit of rounding numbers like $19.87 and $101.15.
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