The following table represents $2020$ sales figures for Mthembu$$s Motors, a car dealership situated in Durban:

Jan

$45$

Feb

$125$

Mar

$20$

Apr

$150$

May

$12$

June

$16$

July

$130$

August

$25$

Sept

$33$

Oct

$160$

Nov

$48$

Dec

$37$

Jan $2021$

$3\mathrm{.}1$ Using the data in the table above, calculate the $3-$period moving average. $(15)$

$3\mathrm{.}2$ Very often organizations are confronted on decisions on whether to make or buy items. This entails choosing between producing a component or service or purchasing it from an outside source. The purchasing department$$s role is to evaluate alternative suppliers and provide

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current, accurate and complete data relevant to the buy alternative. Compare the reasons for $$making as opposed to buying$.(10)$