-19.8% is the change from 1000 to 802
Calculation steps:
[( 802 - 1000 ) ÷ 1000] x 100 = -19.8%
Formula
Percentage change = [(802 - 1000) / 1000] x 100
Subtract the new number by the original number
802 - 1000 = -198
-198 ÷ 1000 = -0.198
-0.198 x 100 = -19.8%