-81.65% is the change from 545 to 100
Calculation steps:
[( 100 - 545 ) ÷ 545] x 100 = -81.65%
Formula
Percentage change = [(100 - 545) / 545] x 100
Subtract the new number by the original number
100 - 545 = -445
-445 ÷ 545 = -0.8165137614678899
-0.8165137614678899 x 100 = -81.65%