2928.57% is the change from 21 to 636
Calculation steps:
[( 636 - 21 ) ÷ 21] x 100 = 2928.57%
Formula
Percentage change = [(636 - 21) / 21] x 100
Subtract the new number by the original number
636 - 21 = 615
615 ÷ 21 = 29.285714285714285
29.285714285714285 x 100 = 2928.57%