-30% is the change from 970 to 679
Calculation steps:
[( 679 - 970 ) ÷ 970] x 100 = -30%
Formula
Percentage change = [(679 - 970) / 970] x 100
Subtract the new number by the original number
679 - 970 = -291
-291 ÷ 970 = -0.3
-0.3 x 100 = -30%
Example