Question
A person saves 22% of his monthly income. If his monthly
is increased by 45% 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 = 0.22 × 100x = Rs. 22x Monthly expenditure = 100x – 22x = Rs. 78x His increased monthly income = 1.45 × 100x = Rs. 145x His monthly expenditure now = 145x – 22x = 123x Percentage increase in expenditure = [(123x – 78x)/78x] × 100 ~ 57.7%
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