Ya Chenenko I.V.

In the store, they sell DVD discs - individually and in two types of packages (packages of different types differ in quantity and cost). Vasya calculated how much money is needed to buy $N$ discs (if it is more profitable to buy more discs than needed - Vasya does so):

| $N$ | 1 | 2 | 3 | 4 | 5 | $6-10$ | 11 | 12 | 13 | 14 | 15 | $16-20$ | 21 | 22 | $23-25$ | 26 | 27 | 28 |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| c. | 20 | 40 | 60 | 80 | 100 | 111 | 131 | 151 | 171 | 191 | 211 | 222 | 242 | 262 | 265 | 285 | 305 | 325 |

How many discs were in the packages and at what price were the packages sold?

How much money does Vasya need to buy at least 29 discs?