-77.75% is the change from 391 to 87
Calculation steps:
[( 87 - 391 ) ÷ 391] x 100 = -77.75%
Formula
Percentage change = [(87 - 391) / 391] x 100
Subtract the new number by the original number
87 - 391 = -304
-304 ÷ 391 = -0.7774936061381074
-0.7774936061381074 x 100 = -77.75%