Answer:
\[\text{S}\text{.P = C}\text{.P - Loss}\] \[\Rightarrow \] \[\text{13,500 = C}\text{.P - 20 }\!\!%\!\!\text{ }\]of C.P. \[\Rightarrow \] \[\text{13,500 = C}\text{.P - }\frac{\text{20}}{\text{100}}\text{ }\!\!\times\!\!\text{ C}\text{.P}\] \[\Rightarrow \] \[13,500=\text{C}\text{.P -}\frac{1}{5}\times \text{C}\text{.P}\text{.}\] \[\Rightarrow \] \[13,500=\left( 1-\frac{1}{5} \right)\text{C}\text{.P}\text{.}\] \[\Rightarrow \] \[13,500=\frac{4}{5}\text{C}\text{.P}\text{.}\] \[\Rightarrow \] \[\text{C}\text{.P}\text{.}=\frac{13,500\times 5}{4}\] \[\Rightarrow \] 16,875 Hence, she bought it at price ` 16,875.
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