-82.78% is the change from 540 to 93
Calculation steps:
[( 93 - 540 ) ÷ 540] x 100 = -82.78%
Formula
Percentage change = [(93 - 540) / 540] x 100
Subtract the new number by the original number
93 - 540 = -447
-447 ÷ 540 = -0.8277777777777777
-0.8277777777777777 x 100 = -82.78%