Question

The aggregate monthly expenditure of a family was ₹ 18720 during the first 3 months, ₹ 20340 during the next 4 months and ₹ 21708 during the last 5 months of a year. If the total savings during the year be ₹ 35340 find the average monthly income of the family.

Answer 1

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 = $\frac{281400}{12}=\mathrm{Rs}23450$

Hence, The average monthly income of the family is Rs 23450.