3047.62% is the change from 21 to 661
Calculation steps:
[( 661 - 21 ) ÷ 21] x 100 = 3047.62%
Formula
Percentage change = [(661 - 21) / 21] x 100
Subtract the new number by the original number
661 - 21 = 640
640 ÷ 21 = 30.476190476190474
30.476190476190474 x 100 = 3047.62%