-66% is the change from 800 to 272
Calculation steps:
[( 272 - 800 ) ÷ 800] x 100 = -66%
Formula
Percentage change = [(272 - 800) / 800] x 100
Subtract the new number by the original number
272 - 800 = -528
-528 ÷ 800 = -0.66
-0.66 x 100 = -66%
Example