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

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

Solution:
Let, expenditure 300 and savings be 200
Income = 300 + 200
= 500

New income = 500 + 500 × 15/100
= 500 + 75
= 575

New savings = 200 + 200 × 6/100
= 212

New expenditure = 575 - 212
= 363

% increase = {(363 - 300)/300} × 100%
= 21%