-26.38% is the change from 815 to 600
Calculation steps:
[( 600 - 815 ) ÷ 815] x 100 = -26.38%
Formula
Percentage change = [(600 - 815) / 815] x 100
Subtract the new number by the original number
600 - 815 = -215
-215 ÷ 815 = -0.26380368098159507
-0.26380368098159507 x 100 = -26.38%