-87.87% is the change from 643 to 78
Calculation steps:
[( 78 - 643 ) ÷ 643] x 100 = -87.87%
Formula
Percentage change = [(78 - 643) / 643] x 100
Subtract the new number by the original number
78 - 643 = -565
-565 ÷ 643 = -0.8786936236391913
-0.8786936236391913 x 100 = -87.87%