On January 1 of year 1, Company T purchased an equipment for 250,000 and uses the sum-of-the-years' digits method to depreciate the equipment. The estimated salvage value of the equipment is $25,000 and the estimated useful life is five years. What is the equipment's carrying amount as of December 31 , year 3 ? A. $50,000 B. $60,000 C. $70,000 D. $80,000