It was intended that ₹2,820 be divided among A, B and C in the ratio of 3 : 4 : 5, but by mistake the distribution was made in the proportion of $$\frac{1}{3}:\frac{1}{4}:\frac{1}{5}$$. How much does A gain by the error?

A

₹500

B

₹495

C

₹720

D

₹17