The Sun Ray Company is planning installation of another energy source. Their time horizon and energy usage are uncertain but they expect to be in business for quite a while. Sun Ray can either modify its present system, based on fossil fuels, and stay with that, or else try one of two systems based on renewable resources: solar or wind. The present system, fossil fuels has a cost of only $15,000. A solar-powered system would have an installation cost of $23,000 and a wind-powered system would cost $38,000 up front. However, each 1000KW-hrs. of energy used by Sun Ray will cost an additional $243 for the fossil fuel system, $127 for the solar-powered system, and $97 for the wind-powered system. Based on comparing all three energy sources answer the following: a. Which energy source is preferable in the long run, and why? [ Select] b. Up to how much energy usage (in units of 1000 KW-hrs.) would Sun Ray's needs be most cheaply met using fossil fuels? [Select] c. For what range of energy usage, if any, is the solar-powered system best? [Select]