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UPSC CDS Math Percentage Questions
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© examsnet.com
Question : 9
Total: 31
If the price of wheat rises by 25%, then by how much percent must a man reduce his consumption in order to keep his budget the same as before ?
[2018 CDS-I]
15%
20%
25%
30%
Validate
Solution:
Let the man reduce his consumption by x% to keep his budget same, then
100
+
25
%
–
–
–
–
–
–
–
–
>
125
–
–
–
–
–
–
–
–
>
−
x
%
100
⇒
x
=
25
125
×
100
%
=
20
%
Formula: If the price of wheat rises by r%, then the reduction in consumption in order to keep his budget same as before
=
(
r
100
+
r
)
×
100
%
=
(
25
100
+
25
)
×
100
%
=
20
%
© examsnet.com
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