a) 20%
b) 25%
c) 40%
d) 50%
Answer: a
Explanation:
$$\eqalign{
& \frac{{{\text{Cost price}}}}{{{\text{Selling price}}}} = \left. {\frac{5}{4}} \right\}{\text{1 unit loss}} \cr
& {\text{loss}}\% = \frac{1}{5} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\, = 20\% {\text{ loss}} \cr} $$
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