Pls answer soon tysm <3
 please give a detailed answer that tells me which change and which stay the same and which are dependent and which are independent. thank u
 Ben joins a book club. He pays $12 for each book and $5 for shipping and handling
 charges for each order.
 Name the quantities that change in this problem situation and the quantities that
 remain constant. Determine which quantity is independent and which quantity
 is dependent.