HELP ME OUT PLZZ I WILL GIVE BRAINLISt

Answer:
1/20th
Step-by-step explanation:
I did some math in my head and I'm almost positive it is 1/20th because it makes the most logical sense. The chances of the skirt being yellow and the coin landing on that side are very low, that's for sure.
I tried my best. Hope this helps! <333