Question
Z spends 65% of his salary and saves the remaining.
After his salary is increased by 30%, he saves 45% of the increased amount besides the amount he used to save earlier. What will be the percentage change in his monthly savings?Solution
β Let his salary be Rs. 100 β His expenditure = 65% of 100 = Rs. 65 β His saving = Rs. (100 β 65) = Rs. 35 β Salary increased by 30% β New salary = Rs. (100 Γ 130)/100 = Rs. 130 β saving on increased amount = Rs. 45%Β Γ Β 35 = Rs. 15.75 β New Saving = Rs. (35 + 15.75) = Rs. 50.75 β required increase in saving = (50.75 β 35)/35 Γ 100 β΄ required increase in saving = 45%
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