We can start by setting up the equation for this problem. With n being that number, 50 = 4.5% * n. We know that percent is per one hundred, so 4.5% = 4.5/100.
So 50 = 4.5/100 n
Now we need get n. We can do that by multiplying by the reciprocal of n, 100/4.5. Doing that, we get that n is 4.5% of 1,111.11