Supermarket chain Stop & Shop has poured about $400,000 into renovations of the old Johnnie's Foodmaster location on Salem Street in less than two months, and it plans to hold a grand opening for its new store Friday, according to officials.

The Medford store will employ approximately 100, including about 30 former Johnnie’s employees who have been out of a job since the store at 471 Salem St. closed in November, according to an announcement from Stop & Shop.