“Monetary value” = value in terms of the money. Your introduction of apples makes it a trick question, as they are not fungible. (Perhaps this is why there aren’t any notable instances of them evolving into a money anywhere.)
But to answer your question, I would have to assume the monetary value of one unit of money is “one unit”. In pedestrian terms, the monetary value of $1.00, I would have to say is, “$1.00”.