-76.73% is the change from 391 to 91
Calculation steps:
[( 91 - 391 ) ÷ 391] x 100 = -76.73%
Formula
Percentage change = [(91 - 391) / 391] x 100
Subtract the new number by the original number
91 - 391 = -300
-300 ÷ 391 = -0.7672634271099744
-0.7672634271099744 x 100 = -76.73%