-32% is the change from 1000 to 680
Calculation steps:
[( 680 - 1000 ) ÷ 1000] x 100 = -32%
Formula
Percentage change = [(680 - 1000) / 1000] x 100
Subtract the new number by the original number
680 - 1000 = -320
-320 ÷ 1000 = -0.32
-0.32 x 100 = -32%