Upscale retailer Dickson Concepts (International) Ltd on Friday posted a 27 per cent plunge in full-year net profit and revealed plans to invest up to HK$100 million in 50 new stores in the current fiscal year. The firm blamed the global economic slowdown and the impact of September 11 for the slide in profit to HK$41.3 million from HK$56.2m in the year-ago period, although trading conditions picked up in the second half.