-62.73% is the change from 829 to 309
Calculation steps:
[( 309 - 829 ) ÷ 829] x 100 = -62.73%
Formula
Percentage change = [(309 - 829) / 829] x 100
Subtract the new number by the original number
309 - 829 = -520
-520 ÷ 829 = -0.6272617611580217
-0.6272617611580217 x 100 = -62.73%