55.9% is the change from 390 to 608
Calculation steps:
[( 608 - 390 ) ÷ 390] x 100 = 55.9%
Formula
Percentage change = [(608 - 390) / 390] x 100
Subtract the new number by the original number
608 - 390 = 218
218 ÷ 390 = 0.558974358974359
0.558974358974359 x 100 = 55.9%