102.94% is the change from 306 to 621
Calculation steps:
[( 621 - 306 ) ÷ 306] x 100 = 102.94%
Formula
Percentage change = [(621 - 306) / 306] x 100
Subtract the new number by the original number
621 - 306 = 315
315 ÷ 306 = 1.0294117647058822
1.0294117647058822 x 100 = 102.94%