79.99 is what percent of 399.99 - 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 399.99 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 399.99, so we can write it down as 100%=399.99.
4. We know, that x% equals 79.99 of the output value, so we can write it down as x%=79.99.
5. Now we have two simple equations:
1) 100%=399.99
2) x%=79.99
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%=399.99/79.99
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 79.99 is what percent of 399.99

100%/x%=399.99/79.99
(100/x)*x=(399.99/79.99)*x       - we multiply both sides of the equation by x
100=5.0005000625078*x       - we divide both sides of the equation by (5.0005000625078) to get x
100/5.0005000625078=x
19.997999949999=x
x=19.997999949999

now we have:
79.99 is 19.997999949999% of 399.99