$4\mathrm{.}1\mathrm{.}1$ Determine the return on net assets $($ROA$)$ for each company.

$4\mathrm{.}1\mathrm{.}2$ Determine the current ratio for each company.

$4\mathrm{.}1\mathrm{.}3$ Which working capital policy is the most preferred? Explain fully

$4\mathrm{.}2$ The annual demand for a component is $18000$ units. The cost of each unit is R$200,$

ordering cost is R$160$ and the holding cost is R$50$ per unit per$-$year. It takes an order

$2$ days to arrive, and the company is in operation $320$ days in a year.

$4\mathrm{.}2\mathrm{.}1$ Calculate the optimum order quantity.