At a certain online bookstore, the price of each book is the same. The total price of a customer order is the sum of the prices of the books in the order plus a shipping fee that is constant regardless of the number of books purchased. Last year the average (arithmetic mean) number of books per customer order was 1.5. and the average of the total prices of the orders was $10.50. Which of the following amounts could be the book price and the shipping fee last year? Indicate all such amounts. $4.00 per book and $4.50 shipping fee $4.50 per book and $3.50 shipping fee $5.00 per book and $3.00 shipping fee 10 per book and $2.25 shipping fee