Instead of dividing ₹3,910 among P, Q and R in the ratio $$\frac{1}{4}:\frac{1}{5}:\frac{1}{8}$$, by mistake ii was divided in the ratio 4 : 5 : 8. By how much did R gain in this transaction?

A

₹990

B

₹940

C

₹890

D

₹900