17.99 is what percent of 20.99 - 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 20.99 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 20.99, so we can write it down as 100%=20.99.
4. We know, that x% equals 17.99 of the output value, so we can write it down as x%=17.99.
5. Now we have two simple equations:
1) 100%=20.99
2) x%=17.99
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%=20.99/17.99
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 17.99 is what percent of 20.99

100%/x%=20.99/17.99
(100/x)*x=(20.99/17.99)*x       - we multiply both sides of the equation by x
100=1.1667593107282*x       - we divide both sides of the equation by (1.1667593107282) to get x
100/1.1667593107282=x
85.707479752263=x
x=85.707479752263

now we have:
17.99 is 85.707479752263% of 20.99