The analyst in Dorben Company wishes to assign a number of similar machines to an operator based on minimizing the cost per unit of output. The loading and unloading machine standard time is 0.90 minutes and other time spent by the operator such as walking between two machines and inspecting the product is 0.65 minutes. The operator rate is $15/hour, the machine rate or cost is $25/hour, and the machine running time (power feed time) is 2.00 minutes. Do the appropriate cost analysis and use the appropriate formulas to how many machines should be assigned to the operator