-56.85% is the change from 642 to 277
Calculation steps:
[( 277 - 642 ) ÷ 642] x 100 = -56.85%
Formula
Percentage change = [(277 - 642) / 642] x 100
Subtract the new number by the original number
277 - 642 = -365
-365 ÷ 642 = -0.5685358255451713
-0.5685358255451713 x 100 = -56.85%