Three products A, B, and Care produced using four types of machines R1, R2, R3, and R4. The firm owns 3 machines of type R4 and 1 of each other type. One worker is responsible from each machine---a total of 6 workers. The labor costs are $ 15/hr. Workers are available 10 hrs a day for 5 days a week. R1 - 20 min R2 - 10 min R4 - 15 min A, demand = 40/wk price = $90/unit Requirements for A - Raw material: $10/unit, Purchased parts: $20/unit R2-40 min R4 - 30 min R3 - 20 min B, demand = 50/wk price = $100/unit Requirements for B-Raw material: $15/unit, Purchased parts: $15/unit R1 - 30 min R3-25 min R4-20 min C, demand = 80/wk price = $90/unit Requirements for C- Raw material: $5/unit, Purchased parts: $10/unit How many minutes of additional labor are needed eliminate the bottleneck resource? 0 200 0 500 0 700