Sales for the second quarter ended July 28 increased 10.5% to $1.7 billion thanks to a 4.5% increases in same store sales and the addition of 77 new Dollar Tree stores, the company announced Thursday. Net income increased 25.6% to $119.2 million and earnings per share increased 30.8% to 51 cents. The profit performance met analysts’ estimates, but guidance for the third quarter in the range of 47 cents to 51 cents was a penny less than the 52 cents Wall Street expected and shares of the company sold off sharply after the earnings report.