In a year, the average monthly expenditure of Sapna was Rs. 1100 for the first 3 months of the year. Rs. 1000 for the next 5 months and Rs. 1200 for the last 4 months. If the total annual saving was Rs. 1300, then what was Sapna's average monthly income?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Rs. 1200.
Given that
Average monthly expenditure for the first 3 months = 1100
Average monthly expenditure for the next 5 months = 1000
Average monthly expenditure for the last 4 months = 1200
Formula used
Average = sum of observations/ total number of observations
Total expenditure for the first 3 months is given by = 1100 × 3 = 3300
Total expenditure for the next 5 months is given by = 1000 × 5 = 5000
Total expenditure for the last 4 months is given by = 1200 × 4 = 4800
Total expenditure in the year = 3300 + 5000 + 4800 = 13100
Total annual savings = 1300
Hence, the total annual income is given by = 13100 + 1300 = 14400
The total monthly income is given by = = 1200.