11 March 2021 | 16:36pm StockMarketWire.com - A strong start to the trading day in the US helped the FTSE 100 erase its lunchtime losses to trade 0.2% higher at 6,736.96 by the close. At 4.30pm UK time the S&P 500 was up 1.4% to 3,954.48 as yesterday's weaker than expected inflation number and the passing of a big US stimulus package helped boost sentiment. Morrisons has seen pre-tax profits fall more than 60% in 2020, with a £290 million hit relating to 'Covid costs', despite a rise in sales and revenue for the high street supermarket chain. Its shares ticked dipped 1% to 175.25p. Rolls Royce has said its performance in 2020 has been 'significantly affected by the Covid-19 pandemic' as it reported a fall in revenue to £11.8 billion. It advanced 0.8% to 113.9p.