I think the answer is 102.38
I learned to do these by setting it up like this:
18.43 = 18
-------- ------- multiply 18.43 x 100, then divide by 18!
x 100
Here's another example:
20 = 10
----- ------- 20 x 100 = 2000, divided by 10 = 200. So 20 is 10% of 200. I hope this makes sense!
x 100
you put the number you know over the number you want to find out, side by side with the percentage as a fraction.