2380.95% is the change from 21 to 521
Calculation steps:
[( 521 - 21 ) ÷ 21] x 100 = 2380.95%
Formula
Percentage change = [(521 - 21) / 21] x 100
Subtract the new number by the original number
521 - 21 = 500
500 ÷ 21 = 23.80952380952381
23.80952380952381 x 100 = 2380.95%