UPSC 2015 CDS I Math Paper

Let the initial income of the person be ₹100
Therefore, saving of the person = ₹ 10
Initial expenditure of the person =100−10=₹90
New income of the person=100+20=₹120
New expenditure of the person=120−10=₹110
Increase in expenditure =110–90=₹20
Therefore, percentage increase inexpenditure
=

Increase in expenditure

Initial expenditure

×100
=

20

90

×100=22

2

9

%