18.52% is the change from 648 to 768
Calculation steps:
[( 768 - 648 ) ÷ 648] x 100 = 18.52%
Formula
Percentage change = [(768 - 648) / 648] x 100
Subtract the new number by the original number
768 - 648 = 120
120 ÷ 648 = 0.18518518518518517
0.18518518518518517 x 100 = 18.52%