Probability of testing positive

Probability Level 1

Suppose that the probability that a random person has a certain disease is $0.005.$ A scientist develops a device which tests a person positive for the disease with $95$ % chance when the person really has the disease. However, the same device tests a person positive for the disease with $1$ % chance when the person in fact does not have the disease. What is the probability that a person really has the disease when tested positive by the device?