-20.85% is the change from 777 to 615
Calculation steps:
[( 615 - 777 ) ÷ 777] x 100 = -20.85%
Formula
Percentage change = [(615 - 777) / 777] x 100
Subtract the new number by the original number
615 - 777 = -162
-162 ÷ 777 = -0.2084942084942085
-0.2084942084942085 x 100 = -20.85%