After two new buyers joined the team, a quarterly audit covered 1,800 purchase orders containing 7,200 lines. Corrections were needed on 162 lines spread across 108 POs. What was the PO error rate, measured by purchase order?
Show answer & explanation
Answer: C
- PO error rate = POs needing correction ÷ total POs
- 108 POs ÷ 1,800 POs = 0.06
- 0.06 × 100 = 6.0%
1.5%: Divides POs with errors by lines (108 ÷ 7,200), mixing two bases.
2.25%: This is the line error rate (162 ÷ 7,200), not the PO error rate.
6.0%: Correct. 108 POs with errors ÷ 1,800 POs = 6.0%.
9.0%: Divides lines with errors by POs (162 ÷ 1,800), mixing two bases.
Keep numerator and denominator on the same basis: POs over POs, or lines over lines.