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Hmm isn't 14 shillings and 5 pence, 15 shillings? bearing in mind a shilling is 5 pence
In old money a shilling was 12 pennies or 12d and there were 20 shillings to a pound which was the rate after decimalisation too. i.e. a shilling became 5 new pence or 5p
So 14 shillings is 70p in new money and the price of a mars bar is 72p leaving 2p to be found in old money which is 2/5 * 12 ... approx 5d