By DPA,
Vienna : The price for crude oil produced by the Organisation of the Petroleum Exporting Countries (OPEC) has declined slightly, according to a data released by OPEC Tuesday.
One barrel (159 litres) of OPEC-produced crude stood at $120.80 Monday, 28 cents lower than the $121.08 recorded the previous day.
OPEC calculates an average basket price based on 13 important brands produced by cartel members.
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