You need to create a chart like the one attached and put your own values in it. The teacher wants atleast 3 inputs and outputs but 4 or 5 is better. You first need to create a rule (EX: x+1=y)
4/20=x/100 20 times 5 equal 100 so 5 times 4 equals 20 so the answer is 20%
I believe it would be x=2i
:)