PLEASE PROVIDE EXPLANATION

18. Crimson Inc. has a number of divisions, including Alpha Division, a producer of circuit boards, and Delta Division, a heating and air-conditioning manufacturer. Alpha Division produces the cb-117 model that can be used by Delta Division in the production of thermostats that regulate heating and air-conditioning systems. The market price of the cb117 is $20, and the full cost of the circuit board is $13. Assume Crimson allows negotiated transfer pricing and Alpha Division can avoid $5 of selling expense by selling to Delta Division. Is the transfer price of $13 acceptable to the Alpha and Delta divisions