3976.19% is the change from 21 to 856
Calculation steps:
[( 856 - 21 ) ÷ 21] x 100 = 3976.19%
Formula
Percentage change = [(856 - 21) / 21] x 100
Subtract the new number by the original number
856 - 21 = 835
835 ÷ 21 = 39.76190476190476
39.76190476190476 x 100 = 3976.19%