What is 103.9 percent of 87 - 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 87 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 87 is 100%, so we can write it down as 87=100%.
4. We know, that x is 103.9% of the output value, so we can write it down as x=103.9%.
5. Now we have two simple equations:
1) 87=100%
2) x=103.9%
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:
87/x=100%/103.9%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 103.9% of 87

87/x=100/103.9
(87/x)*x=(100/103.9)*x       - we multiply both sides of the equation by x
87=0.96246390760346*x       - we divide both sides of the equation by (0.96246390760346) to get x
87/0.96246390760346=x
90.393=x
x=90.393

now we have:
103.9% of 87=90.393