-40.05% is the change from 839 to 503
Calculation steps:
[( 503 - 839 ) ÷ 839] x 100 = -40.05%
Formula
Percentage change = [(503 - 839) / 839] x 100
Subtract the new number by the original number
503 - 839 = -336
-336 ÷ 839 = -0.40047675804529204
-0.40047675804529204 x 100 = -40.05%