Цену книги снизили в 1 раз на 15%, а во 2 раз на 4 рубля итог 30 рублей. Первоначальная цена- ?

Выручайте, нужно сделать задание

Rewrite this sentences inthe passive

1. They will interview my sister next week
2. They didn’t ask me my name
3. My mother usually tells fairytales to my younger sister
4. The music that Beethoven composed towards the end of his life is very different from his early music
5. Many beautiful buildings in cities replays modern ones
6. Kate cleaned the room an hour ago
7. They will install the new computer system next month
8. The boys will paint the roof of the house
9. Tom gave Nick an interesting book for his birthday present
10. He received a letter yesterday
11. Ann always invites them to her birthday
12. You promised me these books long ago
13. Mr. Wilson will teach you English
14. Students always forget this rule
15. The teacher always praises his students