Question

a shopkeeper buus some pens for 3 for 30/- and an equal number at 4 for 48/-. He sells them at 5 for 56/-. Find his gain or loss percent

Answer 1

he buys the first 30 pens at 3 =60
second buys 48 pens at 4 = 192
sales 56 pens at 5= 280
remaking inventory =22
plus his profit=88