$$1-135\div180=25\textbackslash\%$$. 
A jacket was on sale. The original price was ＄$$180$$, and Peter bought it at ＄$$135$$. What was the discount rate? 

A) $$135\textbackslash\%$$ 
B) $$180\textbackslash\%$$ 
C) $$75\textbackslash\%$$ 
D) $$25\textbackslash\%$$ 