29.97% is the change from 387 to 503
Calculation steps:
[( 503 - 387 ) ÷ 387] x 100 = 29.97%
Formula
Percentage change = [(503 - 387) / 387] x 100
Subtract the new number by the original number
503 - 387 = 116
116 ÷ 387 = 0.2997416020671835
0.2997416020671835 x 100 = 29.97%