Question
The average expenditure of a man for the first 3 month is Rs.6000 and for the next 9 months is Rs.7500. If he saves 15000 in that year then find his average monthly income.
Solution
Total expenditure in first 3 months = 3 × 6000 = Rs.18000 Total expenditure in last 9 month = 9 × 7500 = Rs.67500 Total income of the man in a year = 18000 + 67500 + 15000 = Rs.100500 So average income in a month = 100500/12 = Rs. 8375
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