64.96% is the change from 391 to 645
Calculation steps:
[( 645 - 391 ) ÷ 391] x 100 = 64.96%
Formula
Percentage change = [(645 - 391) / 391] x 100
Subtract the new number by the original number
645 - 391 = 254
254 ÷ 391 = 0.649616368286445
0.649616368286445 x 100 = 64.96%