-76.73% is the change from 550 to 128
Calculation steps:
[( 128 - 550 ) ÷ 550] x 100 = -76.73%
Formula
Percentage change = [(128 - 550) / 550] x 100
Subtract the new number by the original number
128 - 550 = -422
-422 ÷ 550 = -0.7672727272727272
-0.7672727272727272 x 100 = -76.73%