102.94% is the change from 340 to 690
Calculation steps:
[( 690 - 340 ) ÷ 340] x 100 = 102.94%
Formula
Percentage change = [(690 - 340) / 340] x 100
Subtract the new number by the original number
690 - 340 = 350
350 ÷ 340 = 1.0294117647058822
1.0294117647058822 x 100 = 102.94%