A medical store owner purchased medicines worth Rs. 18,000 from a company. He sold 2/5 part of the medicine at a 35% loss. On which gain, he should sell the rest of the medicines so that he has neither gain nor loss?
1
\(23\frac{2}{3}\%\)
2
\(20\frac{2}{3}\%\)
3
\(20\frac{1}{3}\%\)
4
\(23\frac{1}{3}\%\)