51.78% is the change from 645 to 979
Calculation steps:
[( 979 - 645 ) ÷ 645] x 100 = 51.78%
Formula
Percentage change = [(979 - 645) / 645] x 100
Subtract the new number by the original number
979 - 645 = 334
334 ÷ 645 = 0.517829457364341
0.517829457364341 x 100 = 51.78%