649.5 is what percent of 815 - 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 815 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 815, so we can write it down as 100%=815.
4. We know, that x% equals 649.5 of the output value, so we can write it down as x%=649.5.
5. Now we have two simple equations:
1) 100%=815
2) x%=649.5
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%=815/649.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 649.5 is what percent of 815

100%/x%=815/649.5
(100/x)*x=(815/649.5)*x       - we multiply both sides of the equation by x
100=1.2548113933795*x       - we divide both sides of the equation by (1.2548113933795) to get x
100/1.2548113933795=x
79.693251533742=x
x=79.693251533742

now we have:
649.5 is 79.693251533742% of 815