-92.22% is the change from 643 to 50
Calculation steps:
[( 50 - 643 ) ÷ 643] x 100 = -92.22%
Formula
Percentage change = [(50 - 643) / 643] x 100
Subtract the new number by the original number
50 - 643 = -593
-593 ÷ 643 = -0.9222395023328149
-0.9222395023328149 x 100 = -92.22%