It was 12 pence to the shilling for my first 20 years, and then, in 1966, Australia went decimal. Ten cents to the shilling. Ten shillings became one dollar. In 1970 I went to Britain, hastily remembered my primary school work, and then in 1971 it became 5p to the shilling, 100p to the pound. Lots of mental shuffling.
The Supreme Authority makes Her appearance at 6pm precisely. Dutiful slaves ensure that the repast is ready.