the average expediture of a man for the first 7 months is Rs.120 and for the next 5 months is Rs.130.he withdraw a sum of Rs.220 for his bank.his average monthly earning is ?
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Answer:
In the 1st 7 months his expenditure = 7×120=840
In the next 5 months his expenditure=5×130=650
His total expenditure in 12 months = 840+650=
1490. This is also his earning otherwise how he would spend. In addition he withdraws 220
So his total earning = 1490+220 = 1710
Then his monthly earning = 1710/12 = 142.50
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