-18.05% is the change from 615 to 504
Calculation steps:
[( 504 - 615 ) ÷ 615] x 100 = -18.05%
Formula
Percentage change = [(504 - 615) / 615] x 100
Subtract the new number by the original number
504 - 615 = -111
-111 ÷ 615 = -0.18048780487804877
-0.18048780487804877 x 100 = -18.05%