12.2 Incremental analysis which shows the effect of the make-or-buy decision Notson, Inc. produces several models of clocks. An outside supplier has offered to produce the commercial clocks for Notson for $420 each. Notson needs 1,200 clocks annually. Notson has provided the following unit costs for its commercial clocks: Instructions Prepare an incremental analysis which shows the effect of the make-or-buy decision