Anna's Company reported the following in the long-term asset section of its balance sheet; assume that not PPE was purchased or sold during the period.

	Dec. 31, Year 2	Dec. 31, Year 1
Equipment, net of depreciation of $120,000 and 100,000, respectively	$167,500	$187,500
Patent, net of amortization of $31,500 and $27,000, respectively	88,000	92,500

The company uses the straight-line method to depreciate and amortize all of its operating assets. Assume the salvage value of the equipment is 10% of cost. What is the useful life of equipment? You may round to the nearest year year. Select one:

a. 11

b. 12

c. 13

d. 14

e. 10