4 3 Kansas Enterprises purchased equipment for $78,000 on January 1, 2021. The equipment is expected to have a ten-year service life, with a residual value of $6,600 at the end of ten years. Using the straight-line method, depreciation expense for 2021 would be: 3 points Multiple Choice O $7.140. O $8,460. O $15,600 . $7,800 2,800