An investment of 7,500,000 is expected to produce the following cash flows including decommissioning costs in year 6

Year. Cash Flow

1. -7,500,000

2. 1,750,000

3. 2,250,000

4. 2,750,000

5. 1,650,000

6 -1,250,000

calculate the conventional payback period of the investment

a. 3.123 years

b. 3.853 years

c. 3.533 years

d. 3.273 years