Answer:
C. 25.5%
Explanation:
Net operating cashflow = (250,000 - 100,000) = 150,000; This is a recurring cashflow; the PMT
Cost of equipment; the PV = 400,000
Next, calculate the rate of return  using Net operating cashflow per year and the equipment cost. You can do this with a financial calculator;
N =5
PMT = 150,000
FV = 0
PV = -400,000
then CPT I/Y = 25.41%
Therefore the return is closest to 25.5%