The Public Transport Authority in Australia operates Transperth. Transperth is a transportation service providing buses, trains and ferries for the Perth metropolitan area.
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You can purchase it on Transperth website, or on the same bus, you tell the bus driver to give you a ticket. The cost per journey for adults is $0.80 and for students or family rider is free with SmartRider.
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Hope this answer wasn't too late for you :)
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