-83.64% is the change from 642 to 105
Calculation steps:
[( 105 - 642 ) ÷ 642] x 100 = -83.64%
Formula
Percentage change = [(105 - 642) / 642] x 100
Subtract the new number by the original number
105 - 642 = -537
-537 ÷ 642 = -0.8364485981308412
-0.8364485981308412 x 100 = -83.64%