Answer and Explanation:
a. The negotiable range for the transfer price is lies between the $6 and $18 as the netting division is suffering from losses if the selling price is less than the variable cost per unit but at the same time the maximum price for transferring the product is equivalent to the selling price i.e $18
b. The minimum transfer price is $18 in the case when operating at capacity if it is below than the minimum transfer price is $6
c. The maximum transfer price should be equivalent to the purchase price that is purchased from the outside vendor i.e $15