50% is the change from 518 to 777
Calculation steps:
[( 777 - 518 ) ÷ 518] x 100 = 50%
Formula
Percentage change = [(777 - 518) / 518] x 100
Subtract the new number by the original number
777 - 518 = 259
259 ÷ 518 = 0.5
0.5 x 100 = 50%
Example