a. Given the following forecasts and steady regular output of 550 every month, what total cost would result if overtime is limited to a maximum of 40 units a month, and subcontracting is limited to a maximum of 10 units a month? (Negative answers should be indicated by a minus sign. Do not leave any empty spaces; input a 0 wherever it is required.) b. Suppose backorders are not allowed. Modify your plan from part a to accommodate this as economically as possible. The limits on overtime and subcontracting remain the same. (Negative answers should be indicated by a minus sign. Do not leave any empty spaces; input a 0 wherever it is required.)