We multiple 0.4 divided by 0.02, by 100 over 100. We can do this because 100 over 100 is still technically 1. We are just making the terms simpler and easier to understand.
0.4 100 40
--------- x --------- = -------
0.02 100 2
Now that we know (0.4/0.02) equals (40/2), we can solve the equation easily.
40 divided by 2 equals 20.
Answer: 20
