-18.8% is the change from 1000 to 812
Calculation steps:
[( 812 - 1000 ) ÷ 1000] x 100 = -18.8%
Formula
Percentage change = [(812 - 1000) / 1000] x 100
Subtract the new number by the original number
812 - 1000 = -188
-188 ÷ 1000 = -0.188
-0.188 x 100 = -18.8%