What was the budget (Australian dollars) for the original "Mad Max" film?

"Mad Max" is a 1979 Australian dystopian action film directed by George Miller, produced by Byron Kennedy, and starring Mel Gibson as "Mad" Max Rockatansky, Joanne Samuel, Hugh Keays-Byrne, Steve Bisley, Tim Burns, and Roger Ward. James McCausland and Miller wrote the screenplay from a story by Miller and Kennedy. The film presents a tale of societal collapse, murder, and revenge set in a future Australia, in which an unhinged policeman becomes embroiled in a violent feud with a savage motorcycle gang. Principal photography took place in and around Melbourne, Australia, and lasted six weeks.

The film initially received a polarized reception upon its release in April 1979, although it won three Australian Academy of Cinema and Television Arts (AACTA) Awards and attracted a cult following, while its critical reputation has grown since. Filmed on a budget of A$400,000, it earned more than US$100 million worldwide in gross revenue and held the Guinness record for most profitable film. The success of "Mad Max" has been credited for further opening up the global market to Australian New Wave films. The film became the first in the "Mad Max" series, giving rise to three sequels, "Mad Max 2" (1981), "Beyond Thunderdome" (1985), and "Fury Road" (2015).