John needs to buy a collection of books for the course that he is studying. The individual prices of the books are $30, $35 and $45. There are three different bookshops that John could go to in order to buy the books, each of which will offer different discounts: The first shop sells all of the books at 10% less than the usual price. The second shop gives a discount of $10 on any purchase of $75 or more. The third shop gives a discount of 20% on any book that normally costs more than $40. John will buy all of the books at the same shop and will choose the shop that gives him the cheapest price. How much will John pay for the books?