-48.57% is the change from 665 to 342
Calculation steps:
[( 342 - 665 ) ÷ 665] x 100 = -48.57%
Formula
Percentage change = [(342 - 665) / 665] x 100
Subtract the new number by the original number
342 - 665 = -323
-323 ÷ 665 = -0.4857142857142857
-0.4857142857142857 x 100 = -48.57%