-40.17% is the change from 839 to 502
Calculation steps:
[( 502 - 839 ) ÷ 839] x 100 = -40.17%
Formula
Percentage change = [(502 - 839) / 839] x 100
Subtract the new number by the original number
502 - 839 = -337
-337 ÷ 839 = -0.40166865315852207
-0.40166865315852207 x 100 = -40.17%