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Question

The aggregate monthly expenditure of a family was Rs. 18720 during the first 3 months, Rs. 20340 during the next 4 months and 21708 during the last 5 months of a year. If the total savings during the year be Rs. find the average monthly income of the family.


Solution

ANSWER:
The aggregate yearly expenditure of a family = Rs (18720 × 3) + Rs (20340 × 4) + Rs (21708 × 5)
= Rs (56160 + 81360 + 108540)
= Rs 246060
The total savings during the year = Rs 35340
The average yearly income = Rs 246060 + Rs 35340
= Rs 281400
∴ The average monthly income of the family = 28140012 =Rs 23450
Hence, The average monthly income of the family is Rs 23450.

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