Jack mixed $200$ g of $10\textbackslash\%$ salt solution, $200$ g of $15\textbackslash\%$ salt solution, and $400$ g of $20\textbackslash\%$ salt solution together. What is the percent concentration of salt solution at this time? 
选项为:A:$15\textbackslash\%$  B:$16\textbackslash\%$  C:$16.25\textbackslash\%$  D:$17\textbackslash\%$  请回答其中一个选项.