-97.62% is the change from 839 to 20
Calculation steps:
[( 20 - 839 ) ÷ 839] x 100 = -97.62%
Formula
Percentage change = [(20 - 839) / 839] x 100
Subtract the new number by the original number
20 - 839 = -819
-819 ÷ 839 = -0.9761620977353993
-0.9761620977353993 x 100 = -97.62%