Multiple choice

A faulty weighing machine reads 1 kg when 900 gm is actually weighted on it. The shopkeeper marked the price of his goods by 10%, but unfortunately he was caught by the metrology department and then they ordered him to repair his weighing machine and gave punishment to sell the goods at 10% discount on cost price for a month. If each customer is now paying Rs. 20 for 1 kg, then before the raid _______ amount they have paid for the same quantity. (Rounded off to two places of decimal)

  1. Rs. 27.16

  2. Rs. 27.04

  3. Rs. 28.05

  4. Rs. 28.15
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Faulty machine: 900g costs Rs. 20 (price for 1kg). So 1kg costs (20/900)*1000 = 22.22. Marked price = 22.22 * 1.10 = 24.44. Before the raid, the shopkeeper sold 900g for Rs. 20. The price per kg was 20/0.9 = 22.22. The question asks for the amount paid for the same quantity (1kg) before the raid, which is 22.22 * 1.222... = 27.16.

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