-89.1% is the change from 642 to 70
Calculation steps:
[( 70 - 642 ) ÷ 642] x 100 = -89.1%
Formula
Percentage change = [(70 - 642) / 642] x 100
Subtract the new number by the original number
70 - 642 = -572
-572 ÷ 642 = -0.8909657320872274
-0.8909657320872274 x 100 = -89.1%