Multiple choice general knowledge math & puzzles

a shopkeeper buys a dozen article and sell it for 80% profit but he gives 3 articles for free for every dozen item he sells whats his profit %?

  1. 29%

  2. 36%

  3. 44%

  4. 56%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let CP of 1 article be 1. CP of 12 articles = 12. Selling 12 at 80% profit gives SP = 12 x 1.8 = 21.6. But for every 12 bought, customer gets 15 (12 paid + 3 free). Effective SP per article = 21.6/12 = 1.8. Total SP for 15 articles = 21.6. CP of 15 articles = 15. Profit = 21.6 - 15 = 6.6. Profit% = 6.6/15 x 100 = 44%.

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