Calcul du budget : organisation d'une fête d'anniversaire

You are organizing a birthday party for your friend. You have a budget of $100$ $. You need to buy items for the party:$5$packs of balloons at$4$$ each, $2$ cakes at $15$ $each, and some drinks for$30$$. 1. Calculate the total cost of the items. 2. How much money will be left from the initial $100$ $$?