1842.86% is the change from 21 to 408
Calculation steps:
[( 408 - 21 ) ÷ 21] x 100 = 1842.86%
Formula
Percentage change = [(408 - 21) / 21] x 100
Subtract the new number by the original number
408 - 21 = 387
387 ÷ 21 = 18.428571428571427
18.428571428571427 x 100 = 1842.86%