Letang Industrial Systems Company (LISC) is trying to decide between two different conveyor belt systems. System A costs $285,000, has a four-year life, and requires $89,000 in pretax annual operating costs. System B costs $365,000, has a six-year life, and requires $83,000 in pretax annual operating costs. Suppose the company always needs a conveyor belt system; when one wears out, it must be replaced. Assume the tax rate is 24 percent and the discount rate is 11 percent. Calculate the EAC for both conveyor belt systems.

Power plants that rely on coal increase the amount of sulfur dioxide that dissolves into the air, eventually increasing the acidity of precipitation. the higher acidity of rain and snow can damage forests by making it more difficult for plants to absorb minerals from the soil. the equations below provide information about the market demand and supply of electricity. there is a constant marginal external cost of $25 per unit of electricity. d: qd= 200 – 2ps: qs=p – 10what quantity of electricity satisfies allocative efficiency in this market? a. 60b. 70c. 50d. 43.3