Depends on how much you're going to cook and make meals yourself, versus buying stuff that's already mostly prepared. If you're going to cook and do all the work yourself, probably $300 per month. If you're buying a lot of prepared stuff probably $500+. I spend $400-500 per month on groceries, give or take.
The applicable subheading for the chocolate sprinkles, code CH002, will be 1806.90.9090, Harmonized Tariff Schedule of the United States (HTS), which provides for Chocolate and other food preparations containing cocoa: Other: Other: Other: Other. The rate of duty will be 6.7 percent ad valorem.
If you prepare the chocolate cake from a recipe, one 95-g piece, without frosting, contains 237 calories. Fat content is 9.7 g with 3-1/2 g saturated fat. Baked chocolate cake has 37 mg of cholesterol, 34.2 g carbohydrates, 1 g dietary fiber, 202 mg sodium, 90 mg potassium and 3.4 g of protein. Commercially prepared yellow cake with vanilla frosting has fewer calories than its chocolate counterpart. A 64 g piece contains 239 calories, 84 from fat.