Food & meals : calcul de budget pour un repas

You are organizing a school lunch for $5$ students. Each student needs a balanced meal consisting of: $1$ sandwich, $2$ apples, and a bottle of water. The local shop sells sandwiches at $3.50£$ each, apples at $0.80£$ each, and water bottles at $1.20£$ each. If you have a total budget of $30.00£$, calculate the total cost of the food and determine the remaining balance. Show your calculation for each item type.