2471.43% is the change from 21 to 540
Calculation steps:
[( 540 - 21 ) ÷ 21] x 100 = 2471.43%
Formula
Percentage change = [(540 - 21) / 21] x 100
Subtract the new number by the original number
540 - 21 = 519
519 ÷ 21 = 24.714285714285715
24.714285714285715 x 100 = 2471.43%