Consider an investment with an initial cost of $15,000 and is expected to last for 5 years. The expected cash flow in years 1 and 2 are $5,000, in years 3 and 4 are $5,500 and in year 5 is $1,000. Compute the payback period in years.

	a.	2.91 years
	b.	3.37 years
	c.	3.81 years
	d.	4.22 years
	e.	4.53