It is so very simple and quick to get the answer, especially since, if you need it, you can use the calculator that comes with your computer. But since you are obviously not able to do so, the answer is 0.0011107 approx.
900
900 divided by 4 = 225
0.8889
900
1.8
30
Yes 900 divided by 4 is 225 and 900 divided by 9 is 100
900
900
0.0556
900
112.5