Current Attempt in Progress Crane, Inc. produces several models of clocks. An outside supplier has offered to produce the commercial clocks for Crane for $420 each. Crane needs 980 clocks annually. Crane has provided the following unit costs for its commercial clocks: Prepare an incremental analysis which shows the effect of the make-or-buy decision. (Enter negative amounts using either a negative sign preceding the number eg. -45 or parentheses es. (45))