3895.24% is the change from 21 to 839
Calculation steps:
[( 839 - 21 ) ÷ 21] x 100 = 3895.24%
Formula
Percentage change = [(839 - 21) / 21] x 100
Subtract the new number by the original number
839 - 21 = 818
818 ÷ 21 = 38.95238095238095
38.95238095238095 x 100 = 3895.24%