Answer:
d. $160,000 decrease.
Explanation:
Verizon Manufacturing Company's internal failure cost will be decreased by $160,000 after the projected change.
The finished goods which possess internal failure will be $400,000 * 5 % failure in completed items which is $20,000. The total cost of internal failure will be $20,000 * $80 per failed unit which is $1,600,000.
After the changes the internal failure cost is reduced by 10%, the new internal failure cost will be $20,000 * 90% which is $18,000. The total internal cost after the projected changes will be $18,000 * $80 per failed unit which is $1,440,000.
The change in internal failure cost is $1,600,000 - 1,440,000 = $160,000 decrease.