America will loan you $30,000, a 30% chance that Wells Fargo will loan you $20,000, and a 40% chance that Washington Mutual will loan you $10,000. What is the probability that you will be able to borrow enough money?

What I did: There's a 1 - (1-0.2)(1-0.3)(1-0.4) = 66% chance that at least one of those banks will lend you money. If $10k is enough, then that'll do. But I don't know how to find out the probability of being able to borrow enough money (30k)...

2. A bundle of 40 t-shirts are delivered to the store. They randomly select 4 t-shirts for inspection. If none or one is defective, the bundle is accepted. If two or more are

defective, the bundle is rejected. What is the probability that the bundle will be rejected if only 10% of the bundle is defective?

What I did: So 4 t-shirts are defective, and 36 are not. The probability of getting a defective shirt is 4/40, and the probability of not getting an effective shirt is 36/40. The probability that the shirt is accepted is 37/40, and the probability that a shirt is rejected is 2/40?

I am having such a hard time with these problems, can you guys show me a step-by-step process on how I can arrive to the answer?

Thanks!