Determining missing items in return on investment computation

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

Return on Investment		=	Profit Margin		x	Investment Turnover
23 %		=	10 %		x	(a)
(b)		=	28 %		x	0.75
15 %		=	(c)		x	1.5
14 %		=	20 %		x	(d)
(e)		=	15 %		x	2

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

(a)
(b)	%
(c)	%
(d)
(e)	%