Help!

Suppose you have $100,000 to invest in stocks. If you invest $1000 in any particular stock your profit will be $200, $100, $0, or -$100 with probabillity .25 each. There are 100 different stocks you can choose from, and they all behave independently of each other. Consider the two cases:

1) invest $100,000 in one stock

2) invest 1000 in each of the 100 stocks.

a)for case 1 find the probability that your profit will be $8000 or more.

b) do the same for case 2