42.06% is the change from 642 to 912
Calculation steps:
[( 912 - 642 ) ÷ 642] x 100 = 42.06%
Formula
Percentage change = [(912 - 642) / 642] x 100
Subtract the new number by the original number
912 - 642 = 270
270 ÷ 642 = 0.4205607476635514
0.4205607476635514 x 100 = 42.06%