A person spends 60% of his income. His income increased by 15% and his expenditure increases by 5%, find the % increase in his savings.

Correct option is D

Given
Initial Expenditure = 60% of Income
Income increase = 15%
Expenditure increase = 5%

Formula Used
Saving = Income - Expenditure

Solution
Let Income = 100, Exp = 60, Saving = 40
New Income = 115
New Exp = $$60 \times 1.05 = 63$$​​
New Saving = 115 - 63 = 52
Increase in Saving = 52 - 40 = 12
% Increase = $$\frac{12}{40} \times 100 = 30$$%​

Final Answer
So the correct answer is (d)