Two components, A and B ate used as follows: Normal usage : 50 units each per week Minimum usage : 25 units each per week Maximum usage : 75 units each per week Re-order quantity : Re-order period : Calculate for each component (a) Re-order level, (b) Minimum level, (c) Maximum level, and (d) Average stock level. A: 300 units; B: 500 units A: 4 to 6 weeks; B: 2 to 4 weeks