-81.07% is the change from 428 to 81
Calculation steps:
[( 81 - 428 ) ÷ 428] x 100 = -81.07%
Formula
Percentage change = [(81 - 428) / 428] x 100
Subtract the new number by the original number
81 - 428 = -347
-347 ÷ 428 = -0.8107476635514018
-0.8107476635514018 x 100 = -81.07%