-89.49% is the change from 771 to 81
Calculation steps:
[( 81 - 771 ) ÷ 771] x 100 = -89.49%
Formula
Percentage change = [(81 - 771) / 771] x 100
Subtract the new number by the original number
81 - 771 = -690
-690 ÷ 771 = -0.8949416342412452
-0.8949416342412452 x 100 = -89.49%