unit per month, and zero beginning and ending inventory, evaluate the following plan on an incremental cost basis: whole numbers.) Note: Both hiring and layoff costs are incurred in the month of the change (i.e., going from production of 1,300 in July to 1000 in August requires a layoff (and related costs) of 300 units in August). unit per month, and zero beginning and ending inventory, evaluate the following plan on an incremental cost basis: whole numbers.) Note: Both hiring and layoff costs are incurred in the month of the change (i.e., going from production of 1,300 in July to 1000 in August requires a layoff (and related costs) of 300 units in August)