20.31% is the change from 645 to 776
Calculation steps:
[( 776 - 645 ) ÷ 645] x 100 = 20.31%
Formula
Percentage change = [(776 - 645) / 645] x 100
Subtract the new number by the original number
776 - 645 = 131
131 ÷ 645 = 0.20310077519379846
0.20310077519379846 x 100 = 20.31%