-85.27% is the change from 550 to 81
Calculation steps:
[( 81 - 550 ) ÷ 550] x 100 = -85.27%
Formula
Percentage change = [(81 - 550) / 550] x 100
Subtract the new number by the original number
81 - 550 = -469
-469 ÷ 550 = -0.8527272727272728
-0.8527272727272728 x 100 = -85.27%