Oil set for weekly fall on doubts over extent of OPEC cuts

By Ahmad Ghaddar LONDON (Reuters) - Oil prices are on track to end the week lower on lingering doubts over the extent of OPEC cuts, with sentiment worsened by concerns over the health of the Chinese economy after it reported the steepest falls in exports since 2009. Brent crude futures , the international benchmark for oil prices, were trading 20 cents down at $55.81 a barrel at 1004 GMT on Friday. Exports of Chinese refined oil products last month rose nearly 25 percent year on year to a record