2828.57% is the change from 21 to 615
Calculation steps:
[( 615 - 21 ) ÷ 21] x 100 = 2828.57%
Formula
Percentage change = [(615 - 21) / 21] x 100
Subtract the new number by the original number
615 - 21 = 594
594 ÷ 21 = 28.285714285714285
28.285714285714285 x 100 = 2828.57%