Chapter 2.2, Problem 12E

In a recent survey of monetary donations made by college graduates, the following information was obtained: $95$ graduates had donated a political campaign, $76$ had donated to assist medical research, $133$ had donated to help preserve environment, $25$ had donated to all three, $22$ had donated to none of the three, $38$ had donated to a political campaign and to medical research, $46$ had donated to medical research and to preserve environment, and $54$ had donated to a political campaign and to preserve the environment.

a. What percent of the college graduates donated to none of the three listed causes?

b. What percent of the college graduates donated to exactly one of the three listed causes?