Verified Answer :

zexius

Percentage increase/decrease is hard at first, but easy when you get it. To work this out, you do:

Original number - new number = N
N ÷ original number × 100 = percentage.

So this would be:
270 - 216 = 54
54 ÷ 270 x 100 = 20% decrease.

there would be a 20% decrease; or  -20%

216-270 divided by 270= -20%