Question

a shopkeeper cheats 10%while buying goods and cheats 10%while selling goods. find his profit percent.​

Answer 1

Gain % = 100+common gain %2100-100%

=100+102100-100

= 21%

Answer 2

Let us start the solution by assuming that the shopkeeper buys 100 units. Now he cheated 10% at the time of buying.. which means he bought 10% extra, which is 100 + 10% of 100 = 110. Now while selling the shopkeeper cheats again for 10%, which results in 110 + 10% of 110 = 121.