Question

If A merchant purchases 9 pens and sells 8 pens at the cost price of 9 pens, then his profit percent is:

• A. 5$\frac{15}{17}$
• B. 8$\frac{2}{3}$
• C. 12$\frac{1}{2}$
• D. 11$\frac{1}{9}$

Answer 1

The correct option is C 12$\frac{1}{2}$

Let CP of 1 pen $=x$
CP of 9 pen $=$ 9x and CP of 8 pen $=8x$
According to the question
SP of 8 pens $=9x$
% profit $=$ $\frac{9x-8x}{8x}\times 100$
$=\frac{100}{8}=12\frac{1}{2}$
Hence, option 'C' is correct.