Publix Super Markets Inc. reported big gains in sales and earnings, as consumers eating at home during the COVID-19 pandemic continued to stock up at its supermarkets. Lakeland-based Publix reported last week that fourth-quarter sales rose 14.8% to $11.2 billion, with about $850 million in additional sales related to the pandemic impact. Adjusted earnings rose by 39 cents a share to $1.32. Sales for all of 2020 rose 17.7% to $38.1 billion, including $4.6 billion attributed to pandemic-related sales. Adjusted earnings rose by $1.60 to $5.27 a share. At the end of 2020, Publix operated 1,264 supermarkets in seven states, including 816 in Florida. Publix also said its stock price increased from $57.95 on Nov. 1 to $60.20 as of March 1.