Question
Z spends 60% of his salary and saves the remaining.
After his salary is increased by 30%, he saves 55% of the increased amount besides the amount he used to save earlier. What will be the percentage change in his monthly savings?Solution
Let his salary be Rs. 100 His expenditure = 60% of 100 = Rs. 60 His saving = Rs. (100 – 60) = Rs. 40 Salary increased by 30% New salary = Rs. (100 × 130)/100 = Rs. 130 saving on increased amount = Rs. 55% × 40 = Rs. 22 New Saving = Rs. (40 + 22) = Rs. 62 required increase in saving = (62 – 40)/40 × 100 ∴ required increase in saving = 55%
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