17.5% is the change from 503 to 591
Calculation steps:
[( 591 - 503 ) ÷ 503] x 100 = 17.5%
Formula
Percentage change = [(591 - 503) / 503] x 100
Subtract the new number by the original number
591 - 503 = 88
88 ÷ 503 = 0.1749502982107356
0.1749502982107356 x 100 = 17.5%