-75.86% is the change from 642 to 155
Calculation steps:
[( 155 - 642 ) ÷ 642] x 100 = -75.86%
Formula
Percentage change = [(155 - 642) / 642] x 100
Subtract the new number by the original number
155 - 642 = -487
-487 ÷ 642 = -0.7585669781931464
-0.7585669781931464 x 100 = -75.86%