My textbooks cost a lot. - Ders kitaplarım çok paraya mal olmaktadır.
This book costs 3,000 yen. - Bu kitap 3000 yene mal olmaktadır.
1. (for something) to cost (someone) (a certain amount). 2. to cost (someone his life): İçki hayatına mal oldu. Drink was the death of him. 3. (for something) to be accepted by, be taken up by; to capture the mind of