66.15% is the change from 390 to 648
Calculation steps:
[( 648 - 390 ) ÷ 390] x 100 = 66.15%
Formula
Percentage change = [(648 - 390) / 390] x 100
Subtract the new number by the original number
648 - 390 = 258
258 ÷ 390 = 0.6615384615384615
0.6615384615384615 x 100 = 66.15%