103.28% is the change from 305 to 620
Calculation steps:
[( 620 - 305 ) ÷ 305] x 100 = 103.28%
Formula
Percentage change = [(620 - 305) / 305] x 100
Subtract the new number by the original number
620 - 305 = 315
315 ÷ 305 = 1.0327868852459017
1.0327868852459017 x 100 = 103.28%