300% is the change from 155 to 620
Calculation steps:
[( 620 - 155 ) ÷ 155] x 100 = 300%
Formula
Percentage change = [(620 - 155) / 155] x 100
Subtract the new number by the original number
620 - 155 = 465
465 ÷ 155 = 3
3 x 100 = 300%
Example