Maserati Corporation purchased a new machine and was put into production process on 1-1.an201. - Cost of the machine: $625,000 - Salvage value: $50,000 - Estimated years of useful life: 5 - Total estimated working hours: 50,000 Instruction ( 8 points) a) Calculate depreciation expense for 20X1 using activity method (1 point). Hours used in production in 20X1: 10,000 b) What is depreciation expense for 201 using straight line method ( 1 point)? c) Assuming Maserati Corporation uses sum-of-the-years'-digits method for depreciation, fill out d) Assuming Maserati Corporation uses double declining depreciation method (based on twice the straight-line rate of depreciation), fill out the following form ( 3 points)