A shopkeeper bought 80 kg of rice at a discount of 10% Besides 1 kg rice was offered free to him on the purchase of every 20 kg rice. If he sells the rice at the marked price, his profit percentage will be:
1
\(15\frac{1}{3}\% \)
2
\(16\frac{2}{3}\%\)
3
\(14\frac{2}{7}\%\)
4
\(15\frac{3}{7}\% \)