-39.28% is the change from 835 to 507
Calculation steps:
[( 507 - 835 ) ÷ 835] x 100 = -39.28%
Formula
Percentage change = [(507 - 835) / 835] x 100
Subtract the new number by the original number
507 - 835 = -328
-328 ÷ 835 = -0.39281437125748503
-0.39281437125748503 x 100 = -39.28%