-24.07% is the change from 810 to 615
Calculation steps:
[( 615 - 810 ) ÷ 810] x 100 = -24.07%
Formula
Percentage change = [(615 - 810) / 810] x 100
Subtract the new number by the original number
615 - 810 = -195
-195 ÷ 810 = -0.24074074074074073
-0.24074074074074073 x 100 = -24.07%