2328.57% is the change from 21 to 510
Calculation steps:
[( 510 - 21 ) ÷ 21] x 100 = 2328.57%
Formula
Percentage change = [(510 - 21) / 21] x 100
Subtract the new number by the original number
510 - 21 = 489
489 ÷ 21 = 23.285714285714285
23.285714285714285 x 100 = 2328.57%