-30% is the change from 1000 to 700
Calculation steps:
[( 700 - 1000 ) ÷ 1000] x 100 = -30%
Formula
Percentage change = [(700 - 1000) / 1000] x 100
Subtract the new number by the original number
700 - 1000 = -300
-300 ÷ 1000 = -0.3
-0.3 x 100 = -30%
Example