-81.38% is the change from 650 to 121
Calculation steps:
[( 121 - 650 ) ÷ 650] x 100 = -81.38%
Formula
Percentage change = [(121 - 650) / 650] x 100
Subtract the new number by the original number
121 - 650 = -529
-529 ÷ 650 = -0.8138461538461539
-0.8138461538461539 x 100 = -81.38%