1838.1% is the change from 21 to 407
Calculation steps:
[( 407 - 21 ) ÷ 21] x 100 = 1838.1%
Formula
Percentage change = [(407 - 21) / 21] x 100
Subtract the new number by the original number
407 - 21 = 386
386 ÷ 21 = 18.38095238095238
18.38095238095238 x 100 = 1838.1%