17 and 18 with full explaination.

17. Mr. Numby makes a special product for the space industry. The cost of manufacturing the timer for this product is: Numby has investigated the possibility of buying this product from a subcontractor and has been quoted a price of $6.65 per unit. The relevant cost of manufacturing to be considered in deciding whether to buy the component or manufacture it is: a. $5.80 b. $6.50 c. $6.80 d. $7.50 e. None of the above 18. Maxwell, Ltd. has each month 2,400 hours of plant capacity for making two products, M and N, each with variable costs per unit of $30. Selling prices are $50 for M and $60 for N. Four units of M can be produced per hour or three units of N can be produced per hour. Compute the number of plant hours that should be used each month to manufacture M in order to earn the highest profit. a. None b. 960 c. 1,440 d. 2,400 e. 600