1900% is the change from 31 to 620
Calculation steps:
[( 620 - 31 ) ÷ 31] x 100 = 1900%
Formula
Percentage change = [(620 - 31) / 31] x 100
Subtract the new number by the original number
620 - 31 = 589
589 ÷ 31 = 19
19 x 100 = 1900%
Example