2309.52% is the change from 21 to 506
Calculation steps:
[( 506 - 21 ) ÷ 21] x 100 = 2309.52%
Formula
Percentage change = [(506 - 21) / 21] x 100
Subtract the new number by the original number
506 - 21 = 485
485 ÷ 21 = 23.095238095238095
23.095238095238095 x 100 = 2309.52%