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= Reorder level + EOQ – (Min usage × Min lead time) Assume min usage = 30 units/day, min lead time = 12 days = 800 + 600 – (30 × 12) = 1,400 – 360 = 1,040 units 2. Labour Cost (Wage Payment Systems) Typical Problem: Calculate earnings under Time Rate, Piece Rate, and Halsey/Rowan Premium Plans.

Production depts: P1, P2 Service depts: S1, S2

[ EOQ = \sqrt{\frac{2 \times 12000 \times 150}{50 \times 0.20}} = \sqrt{\frac{36,00,000}{10}} = \sqrt{3,60,000} = 600 \text{ units} ]

= (Max usage × Max lead time) or (Avg usage × Avg lead time) + Safety stock Here, Avg daily usage = 12,000 / 300 = 40 units Reorder level = (40 × 15) + 200 = 600 + 200 = 800 units