At the end of 5 years, the mine will be exhausted and the mining equipment will be worthless. The company accountant must now decide whether to use double declining balance depreciation or unit-of-production depreciation. The company considers 15% to be an appropriate time value of money. (a) Which would you recommend? How much better is the present worth for the recommended choice?h (b) What is talc and how is it used? As the softest mineral, are there special health and environmental issues/risks that are present in the mining, processing, and use of talc?