confused in statistics: grocery coupons

More than 200 billion grocery coupons are distributed each yr for discounts exceeding $84 billion. However, according to a report in USA Today, only 3.2% of the coupons are redeemed. If a company distributes 5000 coupons, what is the probability that:

a) at least 100 coupons are redeemed?

b) fewer than 100 coupons are not redeemed?

c) more than 200 coupons are not redeemed?

This is my last homework problem and I am lost. Please help!

5000 is a nice sample size. Have you considered a Normal Approximation? This would require you to calculate a variance and a couple of z-scores.