-83.64% is the change from 550 to 90
Calculation steps:
[( 90 - 550 ) ÷ 550] x 100 = -83.64%
Formula
Percentage change = [(90 - 550) / 550] x 100
Subtract the new number by the original number
90 - 550 = -460
-460 ÷ 550 = -0.8363636363636363
-0.8363636363636363 x 100 = -83.64%