Hello Vannie. I was born in 1940 and I do have a view of the cost of groceries. You must remember that during the days of WW2 ther was rationing in America. The ability to buy any milk, bread, butter, eggs or meat was severly limited except for black market buying. In the late 40's and early 50's you could fill a car full of groceries that would feed a family of 5 for 2 weeks or more for about $25-$30. There was no such thing as "convience" foods and all meals, cakes, pies, etc. was prepared from scratch.
the saying "a chicken in every pot" was no idle phrase, even in the 40's a chicken cost a lot and beef was cheap.