-98.43% is the change from 829 to 13
Calculation steps:
[( 13 - 829 ) ÷ 829] x 100 = -98.43%
Formula
Percentage change = [(13 - 829) / 829] x 100
Subtract the new number by the original number
13 - 829 = -816
-816 ÷ 829 = -0.9843184559710495
-0.9843184559710495 x 100 = -98.43%