39.47% is the change from 646 to 901
Calculation steps:
[( 901 - 646 ) ÷ 646] x 100 = 39.47%
Formula
Percentage change = [(901 - 646) / 646] x 100
Subtract the new number by the original number
901 - 646 = 255
255 ÷ 646 = 0.39473684210526316
0.39473684210526316 x 100 = 39.47%