(AGI) London, Oct 2 - Oil prices dropped below 89 dollars perbarrel on Thursday due to rising political tension, a slowingglobal economy and abundant supply. A decision by Saudi Arabiato drop its price to Asian buyers in November pushed pricesdown further. Light crude slid 2.09 dollars to a 17-month lowof 88.64 dollars a barrel and Brent fell 2.05 dollars to 92.11dollars a barrel. . .