Question:
Mark (✓) against the correct answer:
A dealer lists his goods at 20% above cost price and allows a discount of 10%. His gain per cent is
(a) 10%
(b) 9%
(c) 8%
(d) 12%
Solution:
(c) 8%
Let the CP be Rs 100 .
Then, marked price $=$ Rs 120
Discount $=10 \%$ of $\mathrm{MP}$
$=(10 \%$ of Rs. 120$)$
$=$ Rs. $\left(120 \times \frac{10}{100}\right)$
$=$ Rs. 12
Now, SP $=($ MP $)-($ discount $)$
$=$ Rs $(120-12)$
$=$ Rs 108
$\therefore$ Gain percentage $=(108-100) \%$
$=8 \%$