100% is the change from 285 to 570
Calculation steps:
[( 570 - 285 ) ÷ 285] x 100 = 100%
Formula
Percentage change = [(570 - 285) / 285] x 100
Subtract the new number by the original number
570 - 285 = 285
285 ÷ 285 = 1
1 x 100 = 100%
Example