55.3% is the change from 642 to 997
Calculation steps:
[( 997 - 642 ) ÷ 642] x 100 = 55.3%
Formula
Percentage change = [(997 - 642) / 642] x 100
Subtract the new number by the original number
997 - 642 = 355
355 ÷ 642 = 0.5529595015576324
0.5529595015576324 x 100 = 55.3%