4.05 is what percent of 9.99 - 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 9.99 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 9.99, so we can write it down as 100%=9.99.
4. We know, that x% equals 4.05 of the output value, so we can write it down as x%=4.05.
5. Now we have two simple equations:
1) 100%=9.99
2) x%=4.05
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%=9.99/4.05
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 4.05 is what percent of 9.99

100%/x%=9.99/4.05
(100/x)*x=(9.99/4.05)*x       - we multiply both sides of the equation by x
100=2.4666666666667*x       - we divide both sides of the equation by (2.4666666666667) to get x
100/2.4666666666667=x
40.540540540541=x
x=40.540540540541

now we have:
4.05 is 40.540540540541% of 9.99