Ritu had 400 mangoes. She sold 60 mangoes at 25% gain, 80 mangoes 20% gain, 120 mangoes at 10% gain and 140 mangoes at 20% loss. Her net gain/loss percent is:

A

$$7\frac{1}{2}\%$$ gain

B

$$4\frac{3}{4}\%$$ loss

C

$$3\frac{3}{4}\%$$ gain

D

None of these