49.07% is the change from 642 to 957
Calculation steps:
[( 957 - 642 ) ÷ 642] x 100 = 49.07%
Formula
Percentage change = [(957 - 642) / 642] x 100
Subtract the new number by the original number
957 - 642 = 315
315 ÷ 642 = 0.49065420560747663
0.49065420560747663 x 100 = 49.07%