-79.95% is the change from 773 to 155
Calculation steps:
[( 155 - 773 ) ÷ 773] x 100 = -79.95%
Formula
Percentage change = [(155 - 773) / 773] x 100
Subtract the new number by the original number
155 - 773 = -618
-618 ÷ 773 = -0.7994825355756792
-0.7994825355756792 x 100 = -79.95%