-77.18% is the change from 355 to 81
Calculation steps:
[( 81 - 355 ) ÷ 355] x 100 = -77.18%
Formula
Percentage change = [(81 - 355) / 355] x 100
Subtract the new number by the original number
81 - 355 = -274
-274 ÷ 355 = -0.7718309859154929
-0.7718309859154929 x 100 = -77.18%