The cost of the meal was 50 she left a $9 tip what was the percent of the tip

Can someone explain the elimination method to me for this problem?

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Ineed no it anyone can see this