-82.12% is the change from 643 to 115
Calculation steps:
[( 115 - 643 ) ÷ 643] x 100 = -82.12%
Formula
Percentage change = [(115 - 643) / 643] x 100
Subtract the new number by the original number
115 - 643 = -528
-528 ÷ 643 = -0.8211508553654744
-0.8211508553654744 x 100 = -82.12%