Case Study Exercises $8-52.$ ?Refer to the case study and repeat the analysis for a reduced study period of five years. $(8\mathrm{.}7)8-53.$ ?Suppose the cost of electricity is expected to increase at the rate of $6\%$ ?per year. How will this new information change your recommendation? Use the original eight $-$ year study period in your analysis. $(8\mathrm{.}7)8-54.$ ?A redesign of the assembly line would only require $1,300$ ?horsepower output. Determine the best combination of motors given this reduced horsepower requirement. $(8\mathrm{.}7)$