So much of the literature we read makes references to monetary systems that seem unfamiliar. Here's a breakdown of the British money, from the farthing to the guiea.
1 farthing (the lowest value coin) = 1/4 penny
A ha'penny (Half-penny - a copper coin) = 1/2 penny
(pronounced "heipnee")
1 penny (a copper coin) = one of the basic units (1d)
Tuppence (two cents) = 2 pence (2d)
Threepence or Thruppenny Bit = 3 pence
(pronounced "thruppence")
Sixpence (a silver coin also called a "tanner") = 6 pence
1 shilling = 12 pence (1s)
1 florin = 2 shillings = 1/10 of a pound
A half-crown = 2 shillings and 6 pence
1 crown = 5 shillings = 1/4 pound
1 pound = 20 shillings = 240 pence (£1)
1 sovereign = a gold coin with a face value of £1
(about .24 ounces of 22 carat gold)
A guinea = a gold coin, originally made of gold
from the Guinea coast of Africa, worth 21s (or £1 and 1s).
A guinea was considered a more gentlemanly amount than £1,
so a gentleman paid his tailor in shillings, but his barrister in guineas.