-86.9% is the change from 542 to 71
Calculation steps:
[( 71 - 542 ) ÷ 542] x 100 = -86.9%
Formula
Percentage change = [(71 - 542) / 542] x 100
Subtract the new number by the original number
71 - 542 = -471
-471 ÷ 542 = -0.8690036900369004
-0.8690036900369004 x 100 = -86.9%