After discount, price became $100\textbackslash\%-20\textbackslash\%=80\textbackslash\%$ of original price.  $\textbackslash$85\times80\textbackslash\%=\textbackslash$85\times0.8=\textbackslash$68$ 
The original price of a pair of shoes was $$\textbackslash$85$$. Then, it was sold at a discount of $$20\textbackslash\%$$. What was the price of the pair of shoes after the discount? 
  $$$17$$ 
  $$$52$$ 
  $$$68$$ 
  $$$102$$ 