-75.55% is the change from 642 to 157
Calculation steps:
[( 157 - 642 ) ÷ 642] x 100 = -75.55%
Formula
Percentage change = [(157 - 642) / 642] x 100
Subtract the new number by the original number
157 - 642 = -485
-485 ÷ 642 = -0.7554517133956387
-0.7554517133956387 x 100 = -75.55%