the previous volumn is 137, the current volumn is 189. What is the increase percentage?

Question

189 is how much percent more than 137

Answer 1

For Percent questions, I recommend you memorize 1 formula:
Part = Percent x Whole
This can be used to find the Part, the Whole, or the Percent. Just make sure you set up your equation correctly, and remember that % means /100 (so 30% = .3).

Let's put this to work on your problem. We know the Part and the Whole; we need the Percent (I'll use X). Now, the trick here is to understand that the Whole is actually 137, because that's what the original was.  So...
189 = 137X
1.3795 = X

Which means 137.95%  Since your question asks "how much more than 137" the answer in this case is 37.95%.

 

BTW- If you mixed up Part & Whole, you'd realize that when your answer was less than 100%.

 

I hope that helps you with any Percent problem you face.

Paul L.