42.66% is the change from 640 to 913
Calculation steps:
[( 913 - 640 ) ÷ 640] x 100 = 42.66%
Formula
Percentage change = [(913 - 640) / 640] x 100
Subtract the new number by the original number
913 - 640 = 273
273 ÷ 640 = 0.4265625
0.4265625 x 100 = 42.66%