$$8\div(8+32)=20\textbackslash\%$$.  ~~ 
A salt solution is made by mixing $$8$$ ounces of pure salt and $$32$$ ounces of water. Find the percent concentration of the solution. 

a. $$10\textbackslash\%$$ 
b. $$15\textbackslash\%$$ 
c. $$20\textbackslash\%$$ 
d. $$25\textbackslash\%$$ 