A mixture of $80$ liters of paint is $20 \textbackslash\%$ red tint, $30 \textbackslash\%$ yellow tint and $50 \textbackslash\%$ water. $20$ liters of yellow tint are added to the original mixture. What is the percent of yellow tint in the new mixture? (adapted from 2007 AMC 8, Question \#17 ) 
选项为:A:$$33$$  B:$$36$$  C:$$39$$  D:$$42$$  E:$$44$$  请回答其中一个选项.