-57.94% is the change from 642 to 270
Calculation steps:
[( 270 - 642 ) ÷ 642] x 100 = -57.94%
Formula
Percentage change = [(270 - 642) / 642] x 100
Subtract the new number by the original number
270 - 642 = -372
-372 ÷ 642 = -0.5794392523364486
-0.5794392523364486 x 100 = -57.94%