Hurdy Headphones wants to determine whether subcontracting the manufacture of their personalized earphones to other electronics companies would reduce the costs of the earphones. Switch to the Earphone Suppliers worksheet, and then run Solver to solve this problem as follows: a. Set the objective as minimizing the value in cell E10 (Total Costs). Use the range B4:04 as the changing variable cells. c. Adjust the number of units produced by each company using the following constraints: o E4=12500, the total number of earphones produces E10