Required:

Calculate the following ratios:

$($a$)$ Gross profit margin

$($b$)$ Operating profit margin

$($c$)$ Sales revenue to capital employed

$($d$)$ Leverage ratio

$($e$)$ Average collection period for receivables

$($f$)$ Times interest earned, assuming income tax expense was nil

$($g$)$ Return on equity

$($h$)$ Return on capital employed.