-26.93% is the change from 531 to 388
Calculation steps:
[( 388 - 531 ) ÷ 531] x 100 = -26.93%
Formula
Percentage change = [(388 - 531) / 531] x 100
Subtract the new number by the original number
388 - 531 = -143
-143 ÷ 531 = -0.2693032015065913
-0.2693032015065913 x 100 = -26.93%