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A shopkeeper earned Rs. 504 in 12 days. His average income for the first four days was Rs. 40 a day. His average income for the remaining days is?

Rs. 40
Rs. 42
Rs. 43
Rs. 45

Correct Answer: Rs. 43

Explanation:

Let the average for remaining 8 days be Rs. y a day.
Then, ( 4 x 40 ) + 8y = 504
⇒ 8y = 344
⇒ y = 43
∴ required average Rs. 43

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