-87% is the change from 669 to 87
Calculation steps:
[( 87 - 669 ) ÷ 669] x 100 = -87%
Formula
Percentage change = [(87 - 669) / 669] x 100
Subtract the new number by the original number
87 - 669 = -582
-582 ÷ 669 = -0.8699551569506726
-0.8699551569506726 x 100 = -87%