Al-Pinar company facing a new investment opportunity, Al-Pinar's manager will accept this investment only if its maximum payback is 3 years & 3 months. the firm will pay a 5% coupon interest rate to finance the machine required for the new investment cost $5,000,000 and it is expected to provide after-tax operating cash inflows of $1,800,000 in year 1, $1,900,000 in year 2, $700,000 in year 3, and $1,800,000 in year 4? Calculate the Payback period