Tom charges a fee of $100 a day to search for an item for the first 5 days and then $60 per day for every day after that. How much did it cost for him to look for an item for 10 days? Give the rationale and then the answer.
Let's think step by step. The first 5 days cost 5 * 100 = $500. He gets 10 - 5 = 5 days on discount. He paid 5 * 60 = $300 at the discounted rate. So in total he pays 500 + 300 = $800.. The answer is: 800.

Léa bought one book for $16, three binders for $2 and six notebooks for $1. Calculate the total cost of her purchases. Give the rationale and then the answer.
Let's think step by step. The binders cost 3 binders * $2 / binder = $6. The notebooks cost 6 notebooks * $1 / notebook = $6. The amount of Lea’s purchases is: $16 + $6 + $6 = $28.. The answer is: 28.

Bert was able to sell 8 toy phones for $18 each, while Tory was able to sell 7 toy guns for $20 each. How much more did Bert earn than Tory? Give the rationale and then the answer.
Let's think step by step. Bert was able to earn 8 x $18 = $144 for the toy phones. While Tory was able to earn 7 x $20 = $140 for the toy guns. Therefore, Bert was able to earn $144 – $140 = $4 more than Tory.. The answer is: 4.