-39.69% is the change from 829 to 500
Calculation steps:
[( 500 - 829 ) ÷ 829] x 100 = -39.69%
Formula
Percentage change = [(500 - 829) / 829] x 100
Subtract the new number by the original number
500 - 829 = -329
-329 ÷ 829 = -0.3968636911942099
-0.3968636911942099 x 100 = -39.69%