A shopkeeper marks his goods 30% above his cost price but allows a discount of 10% at the time of sale. His gain is:

A shopkeeper marks his goods 30% above his cost price but allows a dis

1.	A shopkeeper marks his goods 30% above his cost price but allows a discount of 10% at the time of sale. His gain is:
A.	21%
B.	20%
C.	18%
D.	17%
Answer» E.