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: Direct materials $100 Direct labor 140 Variable overhead 80 Fixed overhead (40% avoidable) 150 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 eg (45).) Incremental Analysis S Incremental Effect