-87% is the change from 700 to 91
Calculation steps:
[( 91 - 700 ) ÷ 700] x 100 = -87%
Formula
Percentage change = [(91 - 700) / 700] x 100
Subtract the new number by the original number
91 - 700 = -609
-609 ÷ 700 = -0.87
-0.87 x 100 = -87%
Example