50.51% is the change from 390 to 587
Calculation steps:
[( 587 - 390 ) ÷ 390] x 100 = 50.51%
Formula
Percentage change = [(587 - 390) / 390] x 100
Subtract the new number by the original number
587 - 390 = 197
197 ÷ 390 = 0.5051282051282051
0.5051282051282051 x 100 = 50.51%