51.4% is the change from 642 to 972
Calculation steps:
[( 972 - 642 ) ÷ 642] x 100 = 51.4%
Formula
Percentage change = [(972 - 642) / 642] x 100
Subtract the new number by the original number
972 - 642 = 330
330 ÷ 642 = 0.514018691588785
0.514018691588785 x 100 = 51.4%