Two components A and B are used as follows: Normal Usage 50 units per week for each Maximum Usage 75 units per week for each Minimum Usage 25 units per week for each Re-order Quantity 200 units B ... 150 units Lead-Time A 4 to 6 weeks B + 2 to 4 weeks Calculate for each component : (i) Re-order Level; (ii) Maximum Level and (iii) Minimum Level