$39.$ A textile company produces shirts and pants. Each shirt requires two square yards of cloth, and each pair of pants requires three square yards of cloth. During the next two months the following demands for shirts and pants must be met $($on time$)$: month $1,1000$ shirts and $1500$ pairs of pants; month $2,1200$ shirts and $1400$ pairs of pants. During each month the following resources are available: month $1,9000$ square yards of cloth; month $2,6000$ square yards of cloth. In addition, cloth that is available during month $1$ and is not used can be used during month $2.$ During each month it costs $$8$ to produce an article of clothing with regular$-$time labor and $$16$ with overtime labor. During each month a total of at most $2500$ articles of clothing can be produced with regular$-$time labor, and an unlimited number of articles of clothing can be produced with overtime labor. At the end of each month, a holding cost of $$3$ per article of clothing is incurred