Worked example · simulated scenario

Shopping for Two Breakfasts With Six Eggs in Stock

One carton can help cover more than one breakfast, but its eggs can only be counted once. This example follows a shared batch across two planned meals so the final shortage reflects the whole shopping period.

You have six eggs and plan to make a two-serving Soft Spinach Scramble on two consecutive mornings.

Plan both breakfasts before calculating

1. Add one inventory batch of six eggs. Keep the batch available through both planned dates.
2. Save Soft Spinach Scramble for breakfast on each date at two servings per meal.
3. Create a shopping list and calculate meal needs for both dates.

Only the difference goes on the list

The list calls for two additional eggs. If you have no other ingredients recorded, the list also needs 160 g of spinach, 20 mL of olive oil and 2 g of fine salt.

The meals need eight eggs altogether and stock supplies six. The two-egg shortage is a period total; subtracting the carton independently from each breakfast would hide part of the purchase requirement.

Mark the eggs purchased at the store. Confirm receipt after bringing them home so the new batch becomes available to future lists.