Use the following equations:

All we need to find now is

We are given 0.95, so we just use the following:

This is a common alpha, and has the corresponding and values:

All you do now is plug and go.

I'll do the n = 100 for you:

So, your CI is between 30.3 and 49.64 percent.

Just do this again for 1000 and 10000.