Plains Preventive Care is combining some of its most commom tests into a bundled, one-price package that contains four tests (Test A, Test B, Test C, and Test D ) with the variable costs as stated below. When the tests are combined, only one syringe, form, and sterile bandage will be used. Furthermore, only one charge for breakage/losses will apply. Three blood vials are required, and reagent costs will remain the same (reagents from all four tests are requried). Using the above information, complete the following table and answer the questions below: a. What is the price of the combined test? b. What price is needed to obtain a $18 contribution margin per test