The calculations are based on

Super fund returns of 7.5% per year

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Salary of $60,000 per year

The average salary for a person of 30 years old in Australia

Ignoring inflation and tax

Superannuations calculated using MoneySmart

https://www.moneysmart.gov.au/tools-and-resources/calculators-and-tools/superannuation-calculator

Brett entered the workforce at age 25

Is now aged 30 years old

Retire at age 67

Superannuation Guarantee rate of 9.5% applying in each year