3100% is the change from 21 to 672
Calculation steps:
[( 672 - 21 ) ÷ 21] x 100 = 3100%
Formula
Percentage change = [(672 - 21) / 21] x 100
Subtract the new number by the original number
672 - 21 = 651
651 ÷ 21 = 31
31 x 100 = 3100%
Example