49.23% is the change from 646 to 964
Calculation steps:
[( 964 - 646 ) ÷ 646] x 100 = 49.23%
Formula
Percentage change = [(964 - 646) / 646] x 100
Subtract the new number by the original number
964 - 646 = 318
318 ÷ 646 = 0.49226006191950467
0.49226006191950467 x 100 = 49.23%