Which one would it be?

Aboat's value over time is given as the function f(x) and graphed below. use a(x) = 400(b)x + 0 as the parent function. which graph shows the boat's value increasing at a rate of 25% per year?

For each proportion find the unknown number x 1/5/8=×/15

Which one ? is the answer and how to find this answer