What is the payback period of a project that costs $75,000 and generates $10,000 in the first year, $25,000 in the second year, $30,000 in the third year, and $15,000 per year for the following 5 years? Select one: O a. 2.7 years O b.3.7 years O c. 4.7 years O d. 1.7 years