21. It costs $53,000 to buy a food truck, which will produce the following incremental after-tax cash inflows: Year 1, $25,000; Year 2, $20,000; Year 3, $20,000; Year 4, $25,000. Your discount rate is 10%. What is the discounted payback period? A. 1.8 years B. 2.4 years C. 2.9 years OD. 3.6 years