A) 20%
B) 30%
C) 25%
D) 40%
Correct Answer: C
Solution :
(c): C.P of 20 greetings = S.P of 16 greeting Let C.P of greeting card be 'x?. Let gain % be r% \[\therefore S.P=x\left( 1+\frac{r}{100} \right)\Rightarrow \]S.P. of 16 cards \[=16x\left( 1+\frac{r}{100} \right)\] \[\Rightarrow 20x=16x\left( 1+\frac{r}{100} \right)\] \[\Rightarrow \frac{4}{5}=\left( 1+\frac{r}{100} \right)\] \[\Rightarrow \frac{1}{4}=\frac{r}{100}\Rightarrow r=25%\]
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