There are 5 workers, each making 30 sofas a month. The maximum number of sofas produced during overtime is 30 per month. Parttime workers can handle a maximum of 20 units per month. Beginning inventory is zero. Develop a plan that minimizes total cost. No ending inventory or backorders are desired at the end of month 6 . (Do not leove ony empty spaces; Input a " 0 " wherever it Is requlred. Negotlve answers should be Indleated by a minus slgn.)