well 5 is a percentage, so it goes over 100. soo its would be like 5%/100% and the 50$ is like the 100% except its not a percentage.. so it would be ... x/50
So from here, you cross multiply,so 5 times 50 equals 250
Now You have to divide 250 by 100
So your answer is: 2.5 OR 2.50
They're both the same. I hope i helped!!