55.6% is the change from 500 to 778
Calculation steps:
[( 778 - 500 ) ÷ 500] x 100 = 55.6%
Formula
Percentage change = [(778 - 500) / 500] x 100
Subtract the new number by the original number
778 - 500 = 278
278 ÷ 500 = 0.556
0.556 x 100 = 55.6%
Example