-62.62% is the change from 642 to 240
Calculation steps:
[( 240 - 642 ) ÷ 642] x 100 = -62.62%
Formula
Percentage change = [(240 - 642) / 642] x 100
Subtract the new number by the original number
240 - 642 = -402
-402 ÷ 642 = -0.6261682242990654
-0.6261682242990654 x 100 = -62.62%