31.01% is the change from 387 to 507
Calculation steps:
[( 507 - 387 ) ÷ 387] x 100 = 31.01%
Formula
Percentage change = [(507 - 387) / 387] x 100
Subtract the new number by the original number
507 - 387 = 120
120 ÷ 387 = 0.31007751937984496
0.31007751937984496 x 100 = 31.01%