-62.38% is the change from 638 to 240
Calculation steps:
[( 240 - 638 ) ÷ 638] x 100 = -62.38%
Formula
Percentage change = [(240 - 638) / 638] x 100
Subtract the new number by the original number
240 - 638 = -398
-398 ÷ 638 = -0.6238244514106583
-0.6238244514106583 x 100 = -62.38%