Find each percent of change and round to the nearest tenth.
1) 10 to 25
2) 70 to 82

Question

mertsj · Answer

Find the change and divide by the original amount.
1.  25-10 = 15 so the change is 15     
15/10 = 1.5 = 150%
Can you do number 2?

anonymous · Answer

1) 82 / 70 = 1.1714 X 100 = 117.1% for number two?

hero · Answer

In general, to find the percent change from one number to another number, use the following formula: 

$$\% \Delta = \frac{|a-b|}{a} \times 100   $$

a = original number
b = new number

mertsj · Answer

You're getting warm.  First you need to find the change.  It it changes from 70 to 82, how much change is that?

anonymous · Answer

12? i thinkkkk. i'm not good at this.. lol.

hero · Answer

What about my formula? Do you understand it?

anonymous · Answer

yes,a little. its just easier for me when people write it out.

hero · Answer

So if 70 = a and 82 = b, you can't plug that into my formula and figure out what the percentage is?