I remember buying lunch at primary school, I would have been 7 years old in 1971
Twenty cents would buy -
a pie or pasty with sauce for 10 cents
a chocolate donut for 8cents
leaving 2 cents for a bag of mixed lollies (and it was a decent sized bag of lollies for 2 cents)
cheers
Twenty cents for lunch would buy a pie or pasty with sauce for 10 centsts for a