Question

a book seller bought 2400 pens at ₹ 15 a dozen .He sold 1050 of them at 5 for ₹8 and remaining at 1 for ₹2.find his gain or loss percent

Answer 1

CP of 2400 pens=2400*15/12=3000
SP of 1050 pens=1050*8/5=1680
remaining pens=2400-1050=1350
SP of 1350 pens=1350*2=2700
SP of 2400 pens=2700+1680=4380
gain=4380-3000=1380
gain%=1380/3000*100=46%
hope it helps:)