Answer:
15 percent
Step-by-step explanation: You will substract the new value from the old value.
23-20
Now you will get the difference between them and divide that by the original amount.
3/20
This will equal 0.15 in which you now multiply by 100
20
Step-by-step explanation:
You can take a 0 off of 100.
10/5=2
Add the 0 back to the end
20 is your answer.