Question

The average monthly expenditure of a family was rs 2200 during the first three months ,rs 2550 during the next 4 months and rs 3120 during the last 5 months of a year .if the total savings during the year was rs 1260 , find the average monthly income

Answer 1

Average monthly expense for first three months = 2200
Total expense for 3 months = 2200*3 = 6600

Average monthly expense for next 4 months = 2550
Total expense for 4 months = 2550*4 = 10,200

Average monthly expense for last 5 months = 3120
Total expense for 5 months = 3120*5 =  15,600

Total expense for 1 year = 6600 + 10,200 + 15,600 = 32,400
Total savings for 1 year = 1260
Income = Savings + Expense = 32400 + 1260 = 33660
Total income for 1 year = 33660
Average monthly income = 33660/12 = Rs. 2805
Hope it helps