Women's fashion retailer Christopher & Banks Corp has posted a 30 per cent jump in second quarter net profit to $6.9 million from $5.3m in the year-ago period thanks to strong sales and margin improvements. The Minnesota-based operator of 411 stores, including the CJ Banks plus-size clothing chain, said total sales in the quarter to August 31 soared 28 per cent to $73.9m from $57.8m, with same-store sales up six per cent.