Answer:
Answer is B.
Step-by-step explanation:
In accordance with the given rules f(2) = 1/5 and f(n+1) = f(n) · 10 we get
f(3) = f(2) · 10 = 1/5 · 10 = 2 then
f(4) = f(3) · 10 = 2 · 10 = 20
Good luck!!!
