Determining Missing Items in Return Computation

One item is omitted from each of the following computations of the return on investment:

Rate of Return on Investment $=$ Profit Margin x Investment Turnover

$20\%=10\%$ x $($a$)$

$($b$)=24\%$ x $0\mathrm{.}75$

$18\%=($c$)$ x $1\mathrm{.}5$

$10\%=20\%$ x $($d$)$

$($e$)=15\%$ x $1\mathrm{.}8$

Determine the missing items identified by the letters as shown above. If required, round your answers to two decimal places.

$($a$)$ fill in the blank $1$

$($b$)$ fill in the blank $2\%$

$($c$)$ fill in the blank $3\%$

$($d$)$ fill in the blank $4$

$($e$)$ fill in the blank $5\%$