57.69% is the change from 390 to 615
Calculation steps:
[( 615 - 390 ) ÷ 390] x 100 = 57.69%
Formula
Percentage change = [(615 - 390) / 390] x 100
Subtract the new number by the original number
615 - 390 = 225
225 ÷ 390 = 0.5769230769230769
0.5769230769230769 x 100 = 57.69%