On January 1, 2013, Dexter Corporation purchased a piece of equipment, which is being depreciated on a double declining balance basis over a useful life of 5 years, with a residual value of $20,000. The equipment's accumulated depreciation account has a credit balance of $96,000 and an adjusted credit balance of $117,600 on January 1, 2015 and December 31, 2015, respectively. The original cost of the equipment is:

a)None of the other alternatives are correct b)$148,000 c)$170,000 d)$128,000 e)$150,000