-4.41% is the change from 680 to 650
Calculation steps:
[( 650 - 680 ) ÷ 680] x 100 = -4.41%
Formula
Percentage change = [(650 - 680) / 680] x 100
Subtract the new number by the original number
650 - 680 = -30
-30 ÷ 680 = -0.04411764705882353
-0.04411764705882353 x 100 = -4.41%