-83.49% is the change from 545 to 90
Calculation steps:
[( 90 - 545 ) ÷ 545] x 100 = -83.49%
Formula
Percentage change = [(90 - 545) / 545] x 100
Subtract the new number by the original number
90 - 545 = -455
-455 ÷ 545 = -0.8348623853211009
-0.8348623853211009 x 100 = -83.49%