2319.05% is the change from 21 to 508
Calculation steps:
[( 508 - 21 ) ÷ 21] x 100 = 2319.05%
Formula
Percentage change = [(508 - 21) / 21] x 100
Subtract the new number by the original number
508 - 21 = 487
487 ÷ 21 = 23.19047619047619
23.19047619047619 x 100 = 2319.05%