Which preposition to use with fivepence

as Occurrences 2%

In all Sunwich there was only one person who grieved over his departure, and he, after keeping his memory green for two years, wrote off fivepence as a bad debt and dismissed him from his thoughts.

per Occurrences 2%

He had been ordered to take some cheese in the forenoon, so he bought a piece at about eightpence a pound; and as he munched it came this thought: cheese wholesale cost but fivepence per pound; would it not be possible to buy a piece wholesale and sell it to his friends, so that he too might have the benefit of getting it at this low price?

for Occurrences 1%

At night the windows here are black as Father Murphy's hat; 'Tis fivepence for a pint av beer, an' thin ye can't get that; Their beef has shtrings like anny harp, for dacent ham I hunt Och, Muckish Mountain, an' my pig's sweet grunt!

Which preposition to use with  fivepence