A shopkeeper bought 20 kg of sugar at ₹45 per Kg, 25 kg of sugar at ₹50 per kg and 35 kg of sugar at ₹40 per kg. He spent a sum of ₹450 ontransportation and other expenses. He mixed all the three types of sugar andsold all the stock at ₹52.50 per kg. His profit percentin the entire transaction is:

A

5%

B

4.25%

C

6.5%

D

7.25%