Step by step please because I keep trying to solve it myself but it comes out wrong. Please help me understand what I'm doing wrong.

A store manager gathers some demographic information from the store's customers. The following chart summarizes the age-related information they collected: Age Number of Customers 60 60 One customer is chosen at random for a prize giveaway. (Round answers to 4 decimal places.) a. What is the probability that the customer is at least 30 but no older than 49? b. What is the probability that the customer is either older than 60 or younger than 30? c. What is the probability that the customer is at least 60