Additional Brief Exercise 169 outside supplier has offered to produce the commercial clocks for Notson for $420 each. Notson needs 1,200 clocks annually. Notsons has provided the following unit costs for its commercial docks: Direct materials Direct lsbor Veriable overhead Find overhead (40% avoidable) $100 140 80 150 Prepare an Incremental analysis which shows the effect of the make-or-buy decision. (Enter negative amounts using elther a negative sign preceding the number eg. S or parentheses e-g. (45).) Incremental Analysis