-93.67% is the change from 664 to 42
Calculation steps:
[( 42 - 664 ) ÷ 664] x 100 = -93.67%
Formula
Percentage change = [(42 - 664) / 664] x 100
Subtract the new number by the original number
42 - 664 = -622
-622 ÷ 664 = -0.9367469879518072
-0.9367469879518072 x 100 = -93.67%