Note: Opinion is very often very evenly split regarding whether the final term on the right-hand side should be interpreted as:

. . . . .[tex]\mbox{1. }\, \dfrac{d}{2e}[/tex]

...or else as:

. . . . .[tex]\mbox{2. }\, \left(\dfrac{d}{2}\right)(e)[/tex]

The "right" answer will depend upon the exercise author's intention:

. . . . .[tex]\mbox{1. }\, c\, -\, \dfrac{d}{2e}\, =\, (20)\, -\, \dfrac{(10)}{2(2)}\, =\, 20\, -\, 2.5\, =\, 17.5[/tex]

. . . . .[tex]\mbox{2. }\, c\, -\, \dfrac{d}{2}\,\cdot\;e =\, (20)\, -\, \left(\dfrac{(10)}{2}\right)(2)\, =\, 20\, -\, 10\, =\, 10[/tex]

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