A wholesaler buys plastic lamps for $18 each and sells them for $30.60. What is the percent markup based on cost?

Question

jdoe0001 · Answer

$\large \begin{array}{ccllll}
value&\%
\\hline\
18&100\
30.60-18\quad &x
\end{array}\implies \cfrac{18}{30.60-18}=\cfrac{100}{x}$

tkhunny · Answer

Markup based on cost.  (30.60-18.00)/18.00
Markup based on retail price.  (30.60-18.00)/30.60

Be very careful to notice which is wanted.  If it is not specified, you must pick.  Very nicely, this problem specifies clearly!!