-92.55% is the change from 671 to 50
Calculation steps:
[( 50 - 671 ) ÷ 671] x 100 = -92.55%
Formula
Percentage change = [(50 - 671) / 671] x 100
Subtract the new number by the original number
50 - 671 = -621
-621 ÷ 671 = -0.9254843517138599
-0.9254843517138599 x 100 = -92.55%