Question

Some pencils bought at 5 for rs 10 and sold at 6 for rs 15 what is the gain percent

Answer 1

Cost price of 5 pencils is 10

So cost price of 1 pencil is 10/5 ie RS 2

Cost price of 6 pencils is 6*2 ie 12

Now selling price of 6 pencils is 15. Profit = SP -CP. =15 -12 =3 gain percent = (3÷12)*100 = 25%