-40.12% is the change from 840 to 503
Calculation steps:
[( 503 - 840 ) ÷ 840] x 100 = -40.12%
Formula
Percentage change = [(503 - 840) / 840] x 100
Subtract the new number by the original number
503 - 840 = -337
-337 ÷ 840 = -0.4011904761904762
-0.4011904761904762 x 100 = -40.12%