Question
A person saves 25% 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 = 0.25 × 100x = Rs. 25x Monthly expenditure = 100x - 25x = Rs. 75x His increased monthly income = 1.35 × 100x = Rs. 135x His monthly expenditure now = 135x - 25x = 110x Percentage increase in expenditure = [(110x - 75x)/75x] × 100 ~ 46.6%
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