How to get 2 value from same id and same column? - forum topic by nubie

I have this data :
 
ID - Customer - Book - Price
021 - ABC - Book 1 - 120,00
021 - ABC - Book 2 - 150,00
022 - XYZ - Book 3 - 100,00
021 - ABC - Book 2 - 150,00
 
I want to show it like :
ID - Customer - Book - Total Price
021 - ABC - Book 1, Book 2 - 420,00
022 - XYZ - Book 3 - 100,00
 
Please, i need your help.
Thanks, :)