857.5 is what percent of 6400 - 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 6400 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 6400, so we can write it down as 100%=6400.
4. We know, that x% equals 857.5 of the output value, so we can write it down as x%=857.5.
5. Now we have two simple equations:
1) 100%=6400
2) x%=857.5
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%=6400/857.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 857.5 is what percent of 6400

100%/x%=6400/857.5
(100/x)*x=(6400/857.5)*x       - we multiply both sides of the equation by x
100=7.463556851312*x       - we divide both sides of the equation by (7.463556851312) to get x
100/7.463556851312=x
13.3984375=x
x=13.3984375

now we have:
857.5 is 13.3984375% of 6400