49.46% is the change from 645 to 964
Calculation steps:
[( 964 - 645 ) ÷ 645] x 100 = 49.46%
Formula
Percentage change = [(964 - 645) / 645] x 100
Subtract the new number by the original number
964 - 645 = 319
319 ÷ 645 = 0.4945736434108527
0.4945736434108527 x 100 = 49.46%