B. 8.6
Let's substitute the given values into the function and calculate the result. So:
f(t) = Pe^rt
f(t) = 6e^0.06t
f(6) = 6e^(0.06*6)
f(6) = 6e^(0.36)
f(6) = 6*1.433329415
f(6) = 8.599976487
Rounding to the nearest tenth, gives: 8.6
So the answer is "B. 8.6"
