-39.93% is the change from 844 to 507
Calculation steps:
[( 507 - 844 ) ÷ 844] x 100 = -39.93%
Formula
Percentage change = [(507 - 844) / 844] x 100
Subtract the new number by the original number
507 - 844 = -337
-337 ÷ 844 = -0.39928909952606634
-0.39928909952606634 x 100 = -39.93%