-64.91% is the change from 285 to 100
Calculation steps:
[( 100 - 285 ) ÷ 285] x 100 = -64.91%
Formula
Percentage change = [(100 - 285) / 285] x 100
Subtract the new number by the original number
100 - 285 = -185
-185 ÷ 285 = -0.6491228070175439
-0.6491228070175439 x 100 = -64.91%