B1. The daily rental cost of an apartment is 234 euros. Initially, 9 friends went to this apartment for a week of skiing. The amount would be divided into equal parts.

A. How much would each of the nine friends pay for a week's rental of the apartment?

B. Three friends stayed home due to illness. How much more in percentage did each of the friends who were in the apartment have to pay?

C. The friends cooked potatoes in a pan with a diameter of $28 \mathrm{~cm}$. After some water had evaporated, they added enough water to raise the water level by $2 \mathrm{~cm}$. How many deciliters of water did they add?

D. In how many different ways could they prepare a setting with a plate, a glass, and a napkin, if they had 3 different sets of plates, 5 different packs of napkins, and 2 different sets of glasses?
B1. For a seven-day rental of the apartment, each of the nine friends would have paid $1639 \div 9=182$ euros.

Since the costs were split among only six friends, each paid $1639 \div 6=273$ euros, which is 50% more.

The volume of the water in the cylinder is $V=\pi r^{2} h=\pi \cdot 12^{2} \cdot 2 \mathrm{~cm}^{3}=1230.9 \mathrm{~cm}^{3}=12.3 \mathrm{dl}$.

The friends can prepare the salad in $3 \cdot 5 \cdot 2=30$ different ways.

A. Each of the nine friends would have paid 182 euros. ................................... 1 t

B. Each paid 273 euros, .....................................................................................................................................

![](https://cdn.mathpix.com/cropped/2024_06_07_bbf95781e2fd378a6604g-07.jpg?height=60&width=1488&top_left_y=775&top_left_x=364)

C. The calculated volume of the water in the cylinder $V=1230.9 \mathrm{~cm}^{3} \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots \ldots 1 \mathbf{t}$

or 12.3 dl. ..........................................................................................

D. The calculated number of different ways to arrange the salad: $30 . \ldots \ldots \ldots \ldots \ldots . .2$ t