-39.86% is the change from 843 to 507
Calculation steps:
[( 507 - 843 ) ÷ 843] x 100 = -39.86%
Formula
Percentage change = [(507 - 843) / 843] x 100
Subtract the new number by the original number
507 - 843 = -336
-336 ÷ 843 = -0.398576512455516
-0.398576512455516 x 100 = -39.86%