7. Nestašni Darko, upon arriving at the amusement park, forgot about his savings. He spent 4 kuna on two scoops of ice cream, and then spent half of the remaining money on a ride in the bumper cars. Then he bought a chocolate banana for 2 kuna, and spent half of the remaining money on a ride on the carousel. After that, he bought a scoop of ice cream for 2 kuna and spent half of the remaining money on admission to the haunted house. After leaving the haunted house, he bought a cake for 2 kuna and paid for one ride on the train with half of the remaining money. In the end, he had only 3 kuna left. How many kuna did Darko have when he arrived at the amusement park?
First method: Let's start from the end: Darko has 3 kn left.

| cake:  cake $(2 \mathrm{kn})$, ticket $(3 \mathrm{kn})$, remaining $(3 \mathrm{kn})$ | Before buying the cake, he had  $2+3+3=8 \mathrm{kn}$. | 2 POINTS |
| :--- | :--- | ---: |
| ice cream:  ice cream $(2 \mathrm{kn})$, entry $(8 \mathrm{kn})$, remaining $(8 \mathrm{kn})$ | Before buying one scoop of ice cream, he had $2+8+8=18 \mathrm{kn}$. | 2 POINTS |
| banana:  banana $(2 \mathrm{kn})$, ride $(18 \mathrm{kn})$, remaining $(18 \mathrm{kn})$ | Before buying the banana, he had  $2+18+18=38 \mathrm{kn}$. | 2 POINTS |


| ice cream:  ice cream (4 kn), ride ( $38 \mathrm{kn}$ ), remaining ( $38 \mathrm{kn})$ | Before buying the first ice cream, Darko had $4+38+38=80 \mathrm{kn}$. | 2 POINTS |
| :---: | :---: | :---: |
| When Darko arrived at the amusement park, he had 80 kn. |  | 2 POINTS  POINTS |