-97.48% is the change from 834 to 21
Calculation steps:
[( 21 - 834 ) ÷ 834] x 100 = -97.48%
Formula
Percentage change = [(21 - 834) / 834] x 100
Subtract the new number by the original number
21 - 834 = -813
-813 ÷ 834 = -0.9748201438848921
-0.9748201438848921 x 100 = -97.48%