XX produces several models of clocks, XX has provided the following unit costs for its commercial clocks: Direct materials $100 Direct labor 140 Variable overhead 80 Fixed overhead (70% avoidable) 150 xx needs 1,000 clocks annually. An outside supplier has offered XX to produce clocks for $360 each, with an additional $10 per unit required for shipping. If X buy from the outside supplier, it can use the free capacity in making DVDs, which will generate $3000 net contribution Required: In calculating the total relevant costs of make or buy, results will show: $55,000 difference in cost favour of making Correct answer is not provided $55,000 difference in cost in favour of buying $100,000 difference in cost in favour of buying