-80.5% is the change from 523 to 102
Calculation steps:
[( 102 - 523 ) ÷ 523] x 100 = -80.5%
Formula
Percentage change = [(102 - 523) / 523] x 100
Subtract the new number by the original number
102 - 523 = -421
-421 ÷ 523 = -0.8049713193116634
-0.8049713193116634 x 100 = -80.5%