175. The preposition "po", at the rate of, at, is used chiefly before
cardinals and has a distributive sense:
Li marsxas po kvar mejloj cxiutage,
he walks at the rate of four miles daily (every-day).
Mi acxetis kafon po malalta prezo, I bought coffee at a low price.
Mi acxetis viandon po kvarono da dolaro por funto,
I bought meat at a quarter of a dollar for (per) pound.
La cxapelisto acxetas cxapelojn pogrande,
the hatter buys hats wholesale.