Question

Amit bought 25 pens at ₹8 per pen and 35 pens at ₹10 per pen. He sold all 60 pens at ₹11 per pen. Find his gain per cent

Answer 1

CP of 1 pen= 8      CP of 25 pens= 25*8=200

CP of 1 pen= 10    CP of 35 pens= 35*10=350

SP of 1 pen= 11     CP of 60 pens= 11*60=660

Total CP=200+350=550           Total SP=660

Because,SP>CP = Gain         Gain=660-550=110

G%=110/550*100=20%

Therefore your answer is 20%.