The ratio of expenditure and savings is 3 : 2 . If the income increases by 15% and the savings increases by 6% , then by how much percent should his expenditure increases?

Given:

• Expenditure : Savings = 3 : 2
• Income = Expenditure + Savings → 3 + 2 = 5 units

Let original income = Rs. 100

• Then, Expenditure = (3/5) × 100 = Rs. 60
• Savings = (2/5) × 100 = Rs. 40

After increase:

• Income increases by 15% → 100 + 15 = Rs. 115
• Savings increase by 6% → 40 + 6% of 40 = Rs. 42.40

New expenditure = New income – New savings

Expenditure = 115 - 42.40 = Rs. 72.60

Old expenditure = Rs. 60

Increase in expenditure = 72.60 - 60 = 12.60

% Increase = (12.60 / 60) × 100 = 21%

Answer: 21%