100% is the change from 328 to 656
Calculation steps:
[( 656 - 328 ) ÷ 328] x 100 = 100%
Formula
Percentage change = [(656 - 328) / 328] x 100
Subtract the new number by the original number
656 - 328 = 328
328 ÷ 328 = 1
1 x 100 = 100%
Example