By: Al Jupri, M.Sc.
Tom just got home from the bookstore. He bought a very interesting book, titled Ngobrol Mat: Fun Ways to Learn Math. So interesting, Tom immediately read the book when he arrived home.
Seeing Tom read a new book, his mother asks this-that. Including asking the price of the book his son had just bought.
Mom: “Tom’s book Chat Mat is how much does it cost?”
Hearing his mother’s question, as well as being inspired by the reading of his new book, Tom answers in a puzzled way.
Tom : “Mmm…. the price is Rp. 13.500,- plus half the price of this book!”
Getting such a strange answer, Tom’s mother thought, trying to figure out the price of the book.
So, how much does Ngobrol Mat’s bookcost?