A 2,000 square foot house in New Jersey costs $1,725 each winter to heat with its existing oil-burning furnace. For an investment of $5,000, a natural gas furnace can be installed, and the winter heating bill is estimated to be $1,000. If the homeowner’s MARR is 6% per year, what is the simple payback period of this proposed investment? a. 5 years b. 6 years c. 7 years d. 8 years e. 9 years f. 10 years