100% is the change from 428 to 856
Calculation steps:
[( 856 - 428 ) ÷ 428] x 100 = 100%
Formula
Percentage change = [(856 - 428) / 428] x 100
Subtract the new number by the original number
856 - 428 = 428
428 ÷ 428 = 1
1 x 100 = 100%
Example