A local manufacturing company makes two electrical products: air conditioners and large fans. The assembly process for each is similar in that both require a certain amount of wiring and drilling. Each air conditioner takes 3 hours of wiring and 2 hours of drilling. Each fan must go through 2 hours of wiring and 1 hour of drilling. During the next production period, 240 hours of wiring time are available and up to 140 hours of drilling time may be used. Each air conditioner sold yields a profit of $25. Each fan assembled may be sold for a $15 profit. Formula and solve the LP problem. (Hint: using Excel to solve the problem. Save the output with sensitivity analysis. You may see the same problem in other questions.)

If the total drilling time for next period is increased from 140 to 150 hours, which statement below is correct.