-76.87% is the change from 428 to 99
Calculation steps:
[( 99 - 428 ) ÷ 428] x 100 = -76.87%
Formula
Percentage change = [(99 - 428) / 428] x 100
Subtract the new number by the original number
99 - 428 = -329
-329 ÷ 428 = -0.7686915887850467
-0.7686915887850467 x 100 = -76.87%