-95.79% is the change from 642 to 27
Calculation steps:
[( 27 - 642 ) ÷ 642] x 100 = -95.79%
Formula
Percentage change = [(27 - 642) / 642] x 100
Subtract the new number by the original number
27 - 642 = -615
-615 ÷ 642 = -0.9579439252336449
-0.9579439252336449 x 100 = -95.79%