100% is the change from 440 to 880
Calculation steps:
[( 880 - 440 ) ÷ 440] x 100 = 100%
Formula
Percentage change = [(880 - 440) / 440] x 100
Subtract the new number by the original number
880 - 440 = 440
440 ÷ 440 = 1
1 x 100 = 100%
Example