A rare disease exists in which only 1 in 500 are affected. A test for the disease exists but course it is not infallible.

A rare disease exists in which only 1 in 500 are affected. A test for the disease exists but course it is not infallible. A correct positive result (patient has disease) occurs 95% of the time while a false positive result (patient does not have disease) occurs 1% of the time. If a randomly selected individual is positive what is the probability that the individual has the disease?