-80.8% is the change from 646 to 124
Calculation steps:
[( 124 - 646 ) ÷ 646] x 100 = -80.8%
Formula
Percentage change = [(124 - 646) / 646] x 100
Subtract the new number by the original number
124 - 646 = -522
-522 ÷ 646 = -0.8080495356037152
-0.8080495356037152 x 100 = -80.8%