The average monthly expenditure of a family for the first four months is Rs. 2570, for the next three months Rs. 2490 and for the last five… — Answer & Discussion

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

ARs. 3000
BRs. 3185
CRs. 3200
DRs. 3580

Answer not set

Join the discussion Report an error

Discussion 1

CCommunity19 Apr 2019

Total number of months = (4 + 3 + 5) months = 12 months

For first 4 months,

Average monthly expenditure = Rs. 2570

∴ Total expenditure in 4 months = 4 × Average expenditure = 4 × 2570 = Rs. 10280

For second 3 months,

Average monthly expenditure = Rs. 2490

∴ Total expenditure in 3 months = 3 × Average expenditure = 3 × 2490 = Rs. 7470

For last 5 months,

Average monthly expenditure = Rs. 3030

∴ Total expenditure in 5 months = 5 × Average expenditure = 5 × 3030 = Rs. 15150

∴ Total expenditure in 12 months = (10280 + 7470 + 15150) = Rs. 32900

Given, Savings during 12 months = Rs. 5320

? Income = Expenditure + Savings

∴ Income in 12 months = Rs. 32900 + Rs. 5320 = Rs. 38220

∴ Average income per month

= (Income in 12 months/Number of months)

= 38220/12 = Rs. 3185