-21.85% is the change from 650 to 508
Calculation steps:
[( 508 - 650 ) ÷ 650] x 100 = -21.85%
Formula
Percentage change = [(508 - 650) / 650] x 100
Subtract the new number by the original number
508 - 650 = -142
-142 ÷ 650 = -0.21846153846153846
-0.21846153846153846 x 100 = -21.85%