please show formula use

The faculty and staff at Dana-Farber Cancer Institute in Boston are required to undergo a tuberculosis test each year. Use the following table to answer the questions below. If a Dana- Farber faculty or staff worker goes in to have a TB test, what is the chance of him/her getting a positive test result? Tuberculosis Test Result Total Yes No Positive 4995 99,950 104,945 Negative 5 9,895,050 9,895,055 Total 5,000 9,995,000 10,000,000