-61.52% is the change from 660 to 254
Calculation steps:
[( 254 - 660 ) ÷ 660] x 100 = -61.52%
Formula
Percentage change = [(254 - 660) / 660] x 100
Subtract the new number by the original number
254 - 660 = -406
-406 ÷ 660 = -0.6151515151515151
-0.6151515151515151 x 100 = -61.52%