Multiple choice general knowledge math & puzzles

The 8" pizza sells for \$ 3.99 at my favorite pizza store. The store claims they have a great deal on the large 14" pizza, which is specially priced at \$ 9.16. What is the per cent discount the store is offering?

  1. 10

  2. 12

  3. 15

  4. 20

  5. 25

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Area of 8" pizza = π × 4² = 16π sq inches. Price per sq inch = $3.99/16π = $0.0795. Area of 14" pizza = π × 7² = 49π sq inches. Expected price = 49π × 0.0795 = $12.25. Actual price = $9.16. Discount = (12.25 - 9.16)/12.16 = 0.25 = 25%.