-6% is the change from 650 to 611
Calculation steps:
[( 611 - 650 ) ÷ 650] x 100 = -6%
Formula
Percentage change = [(611 - 650) / 650] x 100
Subtract the new number by the original number
611 - 650 = -39
-39 ÷ 650 = -0.06
-0.06 x 100 = -6%
Example