How is a png used?

PNG Kina ( dollar) and toea (cents). Some parts of the country also trade using pigs, baskets of taro, sago, sweet potaotes. Kina shells were also used as legal tender until 1993.

A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)

That people wont work.

The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.

There still used for skating or you can give them to a friend for spare parts.