2140% is the change from 30 to 672
Calculation steps:
[( 672 - 30 ) ÷ 30] x 100 = 2140%
Formula
Percentage change = [(672 - 30) / 30] x 100
Subtract the new number by the original number
672 - 30 = 642
642 ÷ 30 = 21.4
21.4 x 100 = 2140%
Example