-17.6% is the change from 784 to 646
Calculation steps:
[( 646 - 784 ) ÷ 784] x 100 = -17.6%
Formula
Percentage change = [(646 - 784) / 784] x 100
Subtract the new number by the original number
646 - 784 = -138
-138 ÷ 784 = -0.1760204081632653
-0.1760204081632653 x 100 = -17.6%