A man purchased 150 pens at the rate of Rs 12 per pen. He sold 50 pens at a gain of 10%. At what gain percent must he sell the remaining pens, so as to gain 15% on the whole transaction?

CP=150*12

=1800

g%=15%

gain=15% of 1800

=15*18

=270

SP=CP+Gain

=1800+270

=2070

CP of 50 pens=50*12

=600

G%=10%

Gain=60

SP=660

SP of remaining 100 pens =2070-660

=1410

CP=12*100

=1200

G=210

G%=G/CP*100%

=17.5%

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thanks seshank! Can you answer the remaining questions

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