Question

12. A man purchased 150 pens at the rate of Rs.12 per pen. He sold 50 pens at a gain
of 10%. The percentage gain at which he must sell the remaining pens so as to gain
15% on the whole outlay is..?
​

Answer 1

Answer:

$17 \frac{1}{2} \%$

Explanation:

Required S.P. of 150 pens

$= 150 \times 12 \times \frac{115}{100}$

$= rs.2070$

S.P. of first 50 pens

$= \frac{50 \times 12 \times 110}{100} = rs.660$

:.Required S.P. of 100 pens

$= 2070 - 660 = rs.1410$

C.P. of 100 pens =Rs.1200

$gain \: percent = \frac{210}{1200} \times 100 = \frac{35}{2}$

$= 17 \frac{1}{2} \%$

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