As-Sallam Company is studying the purchase of a new machinery costing OMR 100,000. The new machinery is expected to have cash inflow of OMR 30,000, OMR 50,000, OMR 40,000 and OMR 35,000 for the first four years. Calculate the payback period. a. 2.25 years b. 2.5 years C. 3.25 years d. 3.5 years