-93.48% is the change from 644 to 42
Calculation steps:
[( 42 - 644 ) ÷ 644] x 100 = -93.48%
Formula
Percentage change = [(42 - 644) / 644] x 100
Subtract the new number by the original number
42 - 644 = -602
-602 ÷ 644 = -0.9347826086956522
-0.9347826086956522 x 100 = -93.48%