Could someone please help me figure out this word problem using a Venn Diagram? After a certain point I am just stuck! It would really help if I could see the steps in order to solve it too! Thanks!

In a recent survey, people were asked which radio station they listened to on a regular basis. The following results were obtained: 140 listened to WOLD (oldies), 95 listened to WJZZ (jazz), 134 listened to WTLK (talk show news), 235 listened WOLD or WJZZ, 48 listened to WOLD and WTLK, 208 listened to WTLK or WJZZ, and 25 listened to none.

a. What percent of people in the survey listened only to WTLK on a regular basis?

b. What percent of people in the survey did not listen to WTLK on a regular basis?