If there is an 80 chance of rain and a 10% chance of wind and rain, what is the probability that it is windy given that it is rainy. round to nearest percent.

We suppose the total chance is 100%. So the chance of wind and rain accounts for 30%. Then it is given rainy. So the total chance will change to 80% and the chance of wind and rain remains constant. Then you can get the answer should be 30%/80%=37.5%≈38%.

It is 13%. I am positive on it