51.32% is the change from 645 to 976
Calculation steps:
[( 976 - 645 ) ÷ 645] x 100 = 51.32%
Formula
Percentage change = [(976 - 645) / 645] x 100
Subtract the new number by the original number
976 - 645 = 331
331 ÷ 645 = 0.5131782945736434
0.5131782945736434 x 100 = 51.32%