Machine C has an initial cost of $40,000, maintenance costs of $5,000 per year and a salvage value of $12,000 after its 3-year useful life. Assuming an interest rate of 10% per year, which of the following would be closest to the present worth of the machine if its life was replicated to a total of 7 years?
a) $-43000
b) $-88100
c) $-74000
d) $-116000