食費

1. Origins, structure, and basic meaning

• Structure: 食費, read しょくひ, means money spent on food.
• Basic usage: It groups spending on meals and ingredients over a period.

2. Common pitfalls and similar expressions

• Period and amount
  • In the example, 一か月の食費 means a month's food expenses.
• Spending and particles
  • 食費が減った says that food expenses decreased.
  • が marks the spending that decreased.
  • In 食費を計算した, を marks what was calculated.