The average monthly expenditure of a family is Rs.2,200 during first three months,Rs.2,550 during next four months and Rs.3,120 during last five months of the year. If the total savings during the year was Rs.1,260, what is the average monthly income ?
Options:
A . Rs.2,805
B . Rs.2,850
C . Rs.1,280
D . Rs.1,260
Answer: Option A Answer: (a)Using Rule 1, Average of two or more numbers/quantities is called the mean of these numbers, which is given by$\text"Average(A)" = \text"Sumof observation / quantities"/\text"No of observation / quantities"$∴ S = A × nTotal expenditure of the year = Rs.(3 × 2200 + 4 × 2550 + 5 × 3120) = Rs. (6600 + 10200 + 15600) = Rs.32400 ∴ Total income of the year = Rs. (32400 + 1260) = Rs.33660 ∴ Average monthly income = Rs.$33660/12$ = Rs. 2805
Submit Comment/FeedBack