Calcul de budget : School trip to London

You are organizing a school trip to London for $45$ students. You have a total budget of $3600$ euros. The expenses are as follows: 1. Train tickets cost $45$ euros per person. 2. Museum entry costs $12$ euros per person. 3. You must hire $2$ tour guides for a total fixed cost of $300$ euros. Calculate the total cost of the trip. If the budget is respected, calculate the surplus $D$ where $D = \text{Budget} - \text{Total Cost}$. If the budget is exceeded, calculate the deficit $D$ where $D = \text{Total Cost} - \text{Budget}$. State the value of $D$ clearly.