-39.95% is the change from 836 to 502
Calculation steps:
[( 502 - 836 ) ÷ 836] x 100 = -39.95%
Formula
Percentage change = [(502 - 836) / 836] x 100
Subtract the new number by the original number
502 - 836 = -334
-334 ÷ 836 = -0.39952153110047844
-0.39952153110047844 x 100 = -39.95%