OK, just think about like this, it takes 100 .01s to get to 1, so our denominator can be 100. then we ask how many .01s do we have? well, 18. that means our numerator is 18.
18/100, then if you need to, simplify. I see that both answers can go into 2, so 9/50, because 18/2 is 9, and 100/2 is 50.