-98.54% is the change from 820 to 12
Calculation steps:
[( 12 - 820 ) ÷ 820] x 100 = -98.54%
Formula
Percentage change = [(12 - 820) / 820] x 100
Subtract the new number by the original number
12 - 820 = -808
-808 ÷ 820 = -0.9853658536585366
-0.9853658536585366 x 100 = -98.54%