Correct Answer - c
(c ) Income of the person = 13500
Expenditure of the person = 9,000
Savings of the person = (13,500 - 9000
4500
`(7xx2+x x1)/(2+1)=14`
14 + x= 42
x= 28
Hence, required increase in savings = 28%
Alternate
First of all find the ratio of income,
exppenditure and savings
% charge in savings ``= (28)/(100)xx100`
= 28%