The average monthly expenditure of a family for the first four months is ₹ 2570, for the next three months ₹ 2490

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The average monthly expenditure of a family for the first four months is ₹ 2570, for the next three months ₹ 2490 and for the last five months ₹ 3030. If the family saves ₹ 5320 during the whole year, the average monthly income of the family during the year is

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Total annual expenditure of the family = Rs. (4 x 2570 + 3 x 2490 + 5 x 3030)

= Rs. (10280 + 7470 + 15150)

= Rs. 32900

Total income = Rs. (32900 + 5320) = Rs. 38220

∴  Required average monthly income = $\frac{3880}{12}$ = Rs. 3185