2442.86% is the change from 21 to 534
Calculation steps:
[( 534 - 21 ) ÷ 21] x 100 = 2442.86%
Formula
Percentage change = [(534 - 21) / 21] x 100
Subtract the new number by the original number
534 - 21 = 513
513 ÷ 21 = 24.428571428571427
24.428571428571427 x 100 = 2442.86%