506.25% is the change from 128 to 776
Calculation steps:
[( 776 - 128 ) ÷ 128] x 100 = 506.25%
Formula
Percentage change = [(776 - 128) / 128] x 100
Subtract the new number by the original number
776 - 128 = 648
648 ÷ 128 = 5.0625
5.0625 x 100 = 506.25%