milan aug 30 reuters  italian borrowing costs climbed to new multiyear highs at an auction on tuesday as euro zone money markets priced a roughly 50 chance of a 75 basispoint european central bank rate hike in september the treasury sold the top planned amount of 8 billion euros 803 billion over four bonds a 5year btp a 10year btp an offtherun btp and a floating rate ccteu rome sold 325 billion euros of a btp maturing dec 1 2027 at a 309 gross yield  the highest level since september 2013  versus 282 at the previous auction it placed 225 billion euros of a 10year btp with a dec 1 2032 maturity fetching a 376 gross yield  a record since january 2014  compared with 346 at the end of july the treasury also assigned 125 billion euros of a 7year floating rate ccteu note due oct 15 2030 at a yield of 104 and an offtherun btp maturing march 1 2030 at a yield of 330