-29.45% is the change from 910 to 642
Calculation steps:
[( 642 - 910 ) ÷ 910] x 100 = -29.45%
Formula
Percentage change = [(642 - 910) / 910] x 100
Subtract the new number by the original number
642 - 910 = -268
-268 ÷ 910 = -0.2945054945054945
-0.2945054945054945 x 100 = -29.45%