Equipment was purchased for $83700 on January 1, 2021. Freight charges amounted to $4000 and there was a cost of $12000 for building a foundation and installing the equipment. It is estimated that the equipment will have a $16000 salvage value at the end of its 5 -year useful life. What is the amount of accumulated depreciation at December 31, 2022 if the straight-line method of depreciation is used? $28140. $33480. $13540. $16740