A machine that was purchased for 2,500 has an estimated useful life of 8 years and a trade-in value of 500. Find the annual depreciation charges using the sinking fund met hod and assuming that the effective rate of interest is 1%. What is the book value at the end of 6 years? Please enter the amount in rounded to the nearest integer. What's the present value of a perpetuity of 1,000 payable semianmu- ally if money is worth 6% compounded monthly and the first payment is due 2 years from now? (a) 56,688.63 (b) 17, 429.62 (c) 31,869.61 (d) 30,092.53 A machine that was purchased for 5,000 has an estimated useful life of 4 years and a trade-in value of 200. Find the annual depreciation charges using the sum of digits met hod and construct a depreciation schedule. What is the accumulated depreciation at the end of year 3? Please enter the amount in rounded to the nearest integer