-10.21% is the change from 715 to 642
Calculation steps:
[( 642 - 715 ) ÷ 715] x 100 = -10.21%
Formula
Percentage change = [(642 - 715) / 715] x 100
Subtract the new number by the original number
642 - 715 = -73
-73 ÷ 715 = -0.1020979020979021
-0.1020979020979021 x 100 = -10.21%