-84.83% is the change from 600 to 91
Calculation steps:
[( 91 - 600 ) ÷ 600] x 100 = -84.83%
Formula
Percentage change = [(91 - 600) / 600] x 100
Subtract the new number by the original number
91 - 600 = -509
-509 ÷ 600 = -0.8483333333333334
-0.8483333333333334 x 100 = -84.83%