100% is the change from 344 to 688
Calculation steps:
[( 688 - 344 ) ÷ 344] x 100 = 100%
Formula
Percentage change = [(688 - 344) / 344] x 100
Subtract the new number by the original number
688 - 344 = 344
344 ÷ 344 = 1
1 x 100 = 100%
Example