Please determine the transactions may result in a book-tax difference and in what amount

purchases of 30 computers on July 1, 2018. The computers cost $15,000 each at a total cost of $450,000. company takes $45,000 in straight line depreciation for the partial year 2018 for book purposes. Assume the computers qualify for bonus depreciation in 2018 and are the only new assets placed into service that year.

What is the amounts need to consider in books. Is there any differences are there between books and Tax