For a marketing survey, 200 customers were classified according to their age (in years) and their favorite type of donut.
Age of Customer	Glazed	Chocolate-covered	Crème-filled	Cake
<21	3	25	10	7
21-30	5	23	26	10
31-45	15	12	3	20
>45	29	5	1	6
(a)	What is the probability that a person prefers Creme-filled donut and is age 45 years or less?