Let's share a pot of tea whilst we discuss how Merkins should also have adopted a monetary system where twelve pennies made a shilling, thirty pennies made a half crown, twenty shillings (or 240 pennies/8 half-crowns/4 crowns) made a pound.
And then there was the thrupenny bit (8 of them in a florin, or a pair in a tanner, with 2 tanners in a bob) which could be exchanged for 6 halfpennies or 12 farthings.
If you had 4 farthings, you could exchange them for a half-groat, whilst 61 groats would get you a guinea and two halfpenny bits.
And there were also notes as well.