3080.95% is the change from 21 to 668
Calculation steps:
[( 668 - 21 ) ÷ 21] x 100 = 3080.95%
Formula
Percentage change = [(668 - 21) / 21] x 100
Subtract the new number by the original number
668 - 21 = 647
647 ÷ 21 = 30.80952380952381
30.80952380952381 x 100 = 3080.95%