The original cost of a distillation tower is $50,000 and the useful life of the tower is estimated to be 15 years. The effective annual interest rate for the depreciation fund is 6 percent. If the scrap value of the distillation tower is $5,000 determine the following 1- The asset value at the end of 4 years if the straight-line method is used? 2- The asset value at the end of 4 years if the Double Declining method is used? 3- The asset value at the end of 4 years if the sinking fund method is used? 4- The asset value at the end of 4 years if sum of the years digits method is used