100% is the change from 338 to 676
Calculation steps:
[( 676 - 338 ) ÷ 338] x 100 = 100%
Formula
Percentage change = [(676 - 338) / 338] x 100
Subtract the new number by the original number
676 - 338 = 338
338 ÷ 338 = 1
1 x 100 = 100%
Example