UK supermarket giant Tesco has reported a 21.3% rise in first-half profits, helped by increased sales due to the summer heat wave. Tesco posted a 21.3% rise in underlying pre-tax profits to £661m (US$1.06bn) for the 24 weeks to 9 August, while pre-tax profit rose 17.4% to £628m. Underlying pre-tax profit excludes net loss on disposal of fixed assets, integration costs and goodwill amortisation.