Describe five $(5)$ methods of purchasing and their application to different circumstances.

$(5$ marks$)$

D$).$ Describe each of the three basic strategies used in developing a production plan. What are the advantages and disadvantages of each. $(9$ marks$)$

E$).$ What is the mean absolute deviation $($MAD$)?$ Why is it useful in forecasting? $(6$ marks$)$

H$).$ List the seven steps in the purchasing cycle $(7$ marks$)$