Question : A shopkeeper has a sale of Rs. 10,000, Rs. 7,500, Rs. 8,000, and Rs. 10,500 for 4 consecutive months. How much sale must he have in the fifth month so he gets an average sale of Rs. 9,000 in five months?
Option 1: Rs. 10,200
Option 2: Rs. 8,500
Option 3: Rs. 11,000
Option 4: Rs. 9,000
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Correct Answer: Rs. 9,000
Solution :
Total sales for the first four months = Rs. 10,000 + Rs. 7,500 + Rs. 8,000 + Rs. 10,500 = Rs. 36,000
If the shopkeeper wants an average sale of Rs. 9,000 over five months, the total sale over five months should be 5 × Rs. 9,000 = Rs. 45,000
Therefore, the sale in the fifth month should be Rs. 45,000 – Rs. 36,000 = Rs. 9,000
Hence, the correct answer is Rs. 9,000.
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