2180% is the change from 30 to 684
Calculation steps:
[( 684 - 30 ) ÷ 30] x 100 = 2180%
Formula
Percentage change = [(684 - 30) / 30] x 100
Subtract the new number by the original number
684 - 30 = 654
654 ÷ 30 = 21.8
21.8 x 100 = 2180%
Example