Consulting Case Interview Practice Questions

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.