-92% is the change from 1000 to 80
Calculation steps:
[( 80 - 1000 ) ÷ 1000] x 100 = -92%
Formula
Percentage change = [(80 - 1000) / 1000] x 100
Subtract the new number by the original number
80 - 1000 = -920
-920 ÷ 1000 = -0.92
-0.92 x 100 = -92%
Example