49.3% is the change from 645 to 963
Calculation steps:
[( 963 - 645 ) ÷ 645] x 100 = 49.3%
Formula
Percentage change = [(963 - 645) / 645] x 100
Subtract the new number by the original number
963 - 645 = 318
318 ÷ 645 = 0.4930232558139535
0.4930232558139535 x 100 = 49.3%