In a sales promotion, a clothing store gives its customers a chance to draw a ticket from a box that contains a discount on their next purchase. The box contains 3000 tickets giving a 10% discount, 500 giving a 30% discount, 100 giving a 50% discount, and 1 giving a 100% discount. What is the probability that a given customer will randomly draw a ticket giving
(a) a 100% discount?
(b) a 50% discount?
(c) a discount of less than 50%?
(d) Is a given customer more likely to get a ticket with a 30% discount or with a discount higher than 30%?