-76.98% is the change from 391 to 90
Calculation steps:
[( 90 - 391 ) ÷ 391] x 100 = -76.98%
Formula
Percentage change = [(90 - 391) / 391] x 100
Subtract the new number by the original number
90 - 391 = -301
-301 ÷ 391 = -0.7698209718670077
-0.7698209718670077 x 100 = -76.98%