The marked price of a headphone is Rs. 800. A shopkeeper purchased it on two successive discounts of 20% and 10%. He spent Rs. 124 on transportation. After that he sold this item on marked price. Find out his gain or loss percentage?
1
\(\rm 16\frac{2}{3}\%\)
2
\(\rm 14\frac{2}{7}\%\)
3
\(\rm 14\frac{1}{2}\%\)
4
\(\rm 12\frac{1}{2}\%\)