Chapter 2.2, Problem 20E

In a recent health insurance survey, employee at large corporation were asked, ”Have you been a patient in a hospital during the past year, and if so, for what reason?”The following results were obtained: $494$ employees had injury, $774$ had an illness, $1254$ had test, $238$ had injury and illness and tests, $700$ had illness and tests, $501$ had tests and no injury or illness, $956$ had an injury or illness, and $1543$ had not been a patient.

a. What percent of the employee had been patients in a hospital?

b. What percent of the employee had tests in a hospital?