At a certain bookstore, the best-selling book, "TOP," costs $8. The least-selling book, "ABC," costs $23. Thirteen "TOP" books and four "ABC" books were sold last week. What is the difference in the bookstore's earnings on these two books last week? Give the rationale and then the answer.
Let's think step by step. On "TOP" books the bookstore made 13 * 8 = $104. The "ABC" books, on the other hand, were sold for a total of 4 * 23 = $92. The difference between earnings from these two books is 104 - 92 = $12.. The answer is: 12.

An aqua park charges $12 admission and $6 for a tour. A group of 10 people goes to the aquarium and takes the tour; while a group of 5 people only goes to the aquarium. How much does the aqua park earn? Give the rationale and then the answer.
Let's think step by step. A group of 10 people is charged $12 + $6 = $18 each. So, 10 people pay $18 x 10 = $180. A group of 5 people pays $12 x 5 = $60 for the admission. Thus, the aqua park earns a total of $180 + $60 = $240.. The answer is: 240.

Bailey bought 8 dog treats and an additional 2 chew toys. She also got 10 more rawhide bones. Sadly, she forgot her money and had to split the charges equally across 4 credit cards. How many items were included in each charge? Give the rationale and then the answer.
Let's think step by step. Bailey got 8 + 2 = 10 dog supplies. After adding the rawhide bones, she had 10 + 10 = 20 dog supplies. She needed to split the charges across 4 cards, so each charge had 20 * .25 = 5 items.. The answer is: 5.