Question:
Tick (✓) the correct answer:
If the selling price of 10 pens is the same as the cost price of 12 pens then gain per cent is
(a) 2%
(b) 12%
(c) 20%
(d) 25%
Solution:
(c) 20%
Let Rs $x$ be the SP of each pen.
SP of 10 pens $=$ CP of 12 pens $=$ Rs $12 x$
CP of 10 pens $=$ Rs $10 x$
Now, gain $=$ Rs $(12 \mathrm{x}-10 \mathrm{x})$
= Rs 12x
$\therefore$ Gain percentage $=\left(\frac{\text { gain }}{\mathrm{CP}} \times 100\right) \%$
$=\left(\frac{2 x}{10 x} \times 100\right) \%$
$=20 \%$
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