Grandma has spent £60 on five books which she is intending to give to her three grandchildren, Miya, Harriet and Mehran. She is going to give the books in a way that relates the cost to the time they normally spend reading (i.e. spend the most on the child who reads the most). Miya reads for an hour a day. Harriet reads for an hour a day on Monday to Thursday and 2 hours a day on Friday to Sunday. Mehran doesn't read on weekdays but does an hour and a half on each of Saturday and Sunday. The details of the books are shown in the table below.