Teen-oriented retailer of music-influence apparel, Hot Topic Inc, on Wednesday posted a sharp rise in second quarter profit on the back of strong sales growth at its network of more than 500 stores. The California-based company reported net income for the quarter ended August 2 of $5.9 million, or 18 cents per share, versus a net profit of $4.3m, or 13 cents, in the year-ago period.