The market price of an article is Rs. 480. After a discount of 18% on the marked price, a shopkeeper earns a profit of Rs. 63.60. His percentage gain is:
1
\(19\frac{1}{{11}}\% \)
2
\(19\frac{3}{{11}}\%\)
3
\(13\frac{1}{{4}}\%\)
4
\(13\frac{3}{{4}}\%\)