1930% is the change from 30 to 609
Calculation steps:
[( 609 - 30 ) ÷ 30] x 100 = 1930%
Formula
Percentage change = [(609 - 30) / 30] x 100
Subtract the new number by the original number
609 - 30 = 579
579 ÷ 30 = 19.3
19.3 x 100 = 1930%
Example