-51.15% is the change from 829 to 405
Calculation steps:
[( 405 - 829 ) ÷ 829] x 100 = -51.15%
Formula
Percentage change = [(405 - 829) / 829] x 100
Subtract the new number by the original number
405 - 829 = -424
-424 ÷ 829 = -0.51145958986731
-0.51145958986731 x 100 = -51.15%