Determining Missing Items in Return Computation

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

$\backslash$table$[[\backslash$table$[[$Rate of Return$],[$on Investment$]],=,$Profit Margin,,$\backslash$table$[[$Investment$],[$Turnover$]]],[17\%,=,10\%,x,($a$)],[($b$),=,16\%,x,0\mathrm{.}75],[12\%,=,($c$),x,1\mathrm{.}5],[16\%,=,20\%,x,($d$)],[($e$),=,15\%,x,1\mathrm{.}4]]$

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

$($a$)$

$($b$)\%$

$($c$)\%$

$($d$)$

$($e$)\%$