-78.74% is the change from 428 to 91
Calculation steps:
[( 91 - 428 ) ÷ 428] x 100 = -78.74%
Formula
Percentage change = [(91 - 428) / 428] x 100
Subtract the new number by the original number
91 - 428 = -337
-337 ÷ 428 = -0.7873831775700935
-0.7873831775700935 x 100 = -78.74%