80 is what percent of 19.99 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 19.99 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 19.99, so we can write it down as 100%=19.99.
4. We know, that x% equals 80 of the output value, so we can write it down as x%=80.
5. Now we have two simple equations:
1) 100%=19.99
2) x%=80
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=19.99/80
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 80 is what percent of 19.99

100%/x%=19.99/80
(100/x)*x=(19.99/80)*x       - we multiply both sides of the equation by x
100=0.249875*x       - we divide both sides of the equation by (0.249875) to get x
100/0.249875=x
400.20010005003=x
x=400.20010005003

now we have:
80 is 400.20010005003% of 19.99