Ace Ltd. manufactures a product and the following particulars are collected for the year ended March, 2011:

Monthly demand (units)

250

Cost of placing an order ( )

100

Annual carrying cost ( per unit)

15

Normal usage (units per week)

50

Minimum usage (units per week)

25

Maximum usage (units per week)

75

Re order period (weeks)

4–6

You are required to calculate:

(i) Re order quantity

(ii) Re order level

(iii) Minimum level

(iv) Maximum level

(v) Average stock level.