50.9% is the change from 387 to 584
Calculation steps:
[( 584 - 387 ) ÷ 387] x 100 = 50.9%
Formula
Percentage change = [(584 - 387) / 387] x 100
Subtract the new number by the original number
584 - 387 = 197
197 ÷ 387 = 0.5090439276485789
0.5090439276485789 x 100 = 50.9%