-38.56% is the change from 817 to 502
Calculation steps:
[( 502 - 817 ) ÷ 817] x 100 = -38.56%
Formula
Percentage change = [(502 - 817) / 817] x 100
Subtract the new number by the original number
502 - 817 = -315
-315 ÷ 817 = -0.38555691554467564
-0.38555691554467564 x 100 = -38.56%