Your question is Bayes Rule for Disease Testing. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
A disease has a 0.1% prevalence rate in the population. A test for this disease has a 99% true positive rate and a 2% false positive rate. If a randomly selected person tests positive, what is the probability that they actually have the disease?