-69% is the change from 1000 to 310
Calculation steps:
[( 310 - 1000 ) ÷ 1000] x 100 = -69%
Formula
Percentage change = [(310 - 1000) / 1000] x 100
Subtract the new number by the original number
310 - 1000 = -690
-690 ÷ 1000 = -0.69
-0.69 x 100 = -69%