-82.1% is the change from 542 to 97
Calculation steps:
[( 97 - 542 ) ÷ 542] x 100 = -82.1%
Formula
Percentage change = [(97 - 542) / 542] x 100
Subtract the new number by the original number
97 - 542 = -445
-445 ÷ 542 = -0.8210332103321033
-0.8210332103321033 x 100 = -82.1%