a) 17 : 20
b) 20 : 17
c) 23 : 15
d) 15 : 23
Answer: b
Explanation:
The loss of percent on article is 15%
$$\eqalign{
& 15\% = \frac{{15}}{{100}} = \frac{{3 \to {\text{Loss}}}}{{20 \to {\text{C}}{\text{.P}}{\text{.}}}} \cr
& {\text{Selling price }} = 17 \cr
& {\text{C}}{\text{.P}}{\text{.}}:{\text{S}}{\text{.P}}{\text{.}} = 20:17 \cr} $$
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