-87.9% is the change from 843 to 102
Calculation steps:
[( 102 - 843 ) ÷ 843] x 100 = -87.9%
Formula
Percentage change = [(102 - 843) / 843] x 100
Subtract the new number by the original number
102 - 843 = -741
-741 ÷ 843 = -0.8790035587188612
-0.8790035587188612 x 100 = -87.9%