function f is defined for each positive 3-digit integer

000666a

1. The function f is defined for each positive 3-digit integer n by f(n)=2x3y5z where x,y,and z are hundreds,tens,and units digits.If m and v are 3 digit positive integers such that f(m) = 9f(v) then m-v=?

A 8

B 9

C 18

D 20

E 80

How to resolve it? Could someone explain it with detailed procedure?