-81.55% is the change from 542 to 100
Calculation steps:
[( 100 - 542 ) ÷ 542] x 100 = -81.55%
Formula
Percentage change = [(100 - 542) / 542] x 100
Subtract the new number by the original number
100 - 542 = -442
-442 ÷ 542 = -0.8154981549815498
-0.8154981549815498 x 100 = -81.55%