Question

Math question down below

Answer 1

Your answer is 500% Here's why: 2. We assume, that x is the value we are looking for.  If 100% equals 45, so we can write it down as 100%=45. 
 We know, that x% equals 225 of the output value, so we can write it down as x%=225. 
Now we have two simple equations:
1) 100%=45
2) x%=225
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%=45/225
 Now we just have to solve the simple equation, and we will get the solution we are looking for.
 Solution for 225 is what percent of 45

100%/x%=45/225
(100/x)*x=(45/225)*x       - we multiply both sides of the equation by x
100=0.2*x       - we divide both sides of the equation by (0.2) to get x
100/0.2=x 
500=x 
x=500

now we have: 
225 is 500% of 45 That's your answer. Hope I helped! 

Answer 2

Set up a proportion

45/225= x/100

45/225 simplifies to 1/5.

1/5= x/100
5*20=100
1*20=20=x

Final answer: 20%