-80.99% is the change from 647 to 123
Calculation steps:
[( 123 - 647 ) ÷ 647] x 100 = -80.99%
Formula
Percentage change = [(123 - 647) / 647] x 100
Subtract the new number by the original number
123 - 647 = -524
-524 ÷ 647 = -0.8098918083462133
-0.8098918083462133 x 100 = -80.99%