-38.48% is the change from 829 to 510
Calculation steps:
[( 510 - 829 ) ÷ 829] x 100 = -38.48%
Formula
Percentage change = [(510 - 829) / 829] x 100
Subtract the new number by the original number
510 - 829 = -319
-319 ÷ 829 = -0.3848009650180941
-0.3848009650180941 x 100 = -38.48%