-61.37% is the change from 642 to 248
Calculation steps:
[( 248 - 642 ) ÷ 642] x 100 = -61.37%
Formula
Percentage change = [(248 - 642) / 642] x 100
Subtract the new number by the original number
248 - 642 = -394
-394 ÷ 642 = -0.6137071651090342
-0.6137071651090342 x 100 = -61.37%