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  1. After allowing a discount of 12% on the marked price, a shopkeeper still gains 21%. The marked price is above the cost price by
    1. 25%
    2. 30%
    3. 37.5%
    4. 42.5%
Correct Option: C

Given that , discount = 12% and gains = 21%
C.P. of article = ₹ 100
Marked price be y .

∴ 
y × 88
= 121
100

⇒  y =
121 × 100
= ₹ 137.5
88

∴ 137.5 - 100 = ₹ 37.5 i.e. 37.5% above C.P.
Second method to solve this question :
Here, r = 12% , R = 21%
With the help of given formula ,
Required percentage =
r + R
× 100%
100 − r

Required percentage =
12 + 21
× 100%
100 − 12

Required percentage =
33
× 100%
88

=
3
× 100
8

Required percentage =
300
% = 37.5%
8



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