-69.94% is the change from 642 to 193
Calculation steps:
[( 193 - 642 ) ÷ 642] x 100 = -69.94%
Formula
Percentage change = [(193 - 642) / 642] x 100
Subtract the new number by the original number
193 - 642 = -449
-449 ÷ 642 = -0.6993769470404985
-0.6993769470404985 x 100 = -69.94%