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A grocer has sales of Rs. 6435, Rs. 6927, Rs. 6855, Rs. 7230, and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs. 6500?

1. Rs. 4991
2. Rs. 5991
3. Rs. 6001
4. Rs. 6991

Correct answer: Rs. 4991

Solution

For an average of Rs. 6500 over 6 months, total sales must be 6500 × 6 = Rs. 39,000. The sum of the first 5 months is Rs. 34,009, so the sixth month sale must be Rs. 39,000 − Rs. 34,009 = Rs. 4,991.

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