Question
A person saves 20% of his monthly income. If his monthly
is increased by 35% and he still saves the same amount as before then find percentage increase (approximate) in his monthly expenditure.Solution
Let monthly of person is Rs. 100x Monthly savings = 0.20 times; 100x = Rs. 20x Monthly expenditure = 100x ndash; 20x = Rs. 80x His increased monthly income = 1.35 times; 100x = Rs. 135x His monthly expenditure now = 135x ndash; 20x = 115x Percentage increase in expenditure = [(115x ndash; 80x)/80x] times; 100 ~ 43.75%
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