math
posted by Anonymous on .
A woman goes to a store that sells used books and spends half of her money on books. Each day, she returns to the store and again spends half of her remaining money on books because she does not want to spend all of her money in one day. When she no longer has enough money to buy additional books, how much money will she have left?

How much money does she start with?
How much does each book cost?