Help me with the interview ?

Sorry guys for the irrelevant question but I have an interview today as a financial analyst in a petroleum company .well I don¡¦t know much about the petroleum sector .may be you can help me with the following questions : „« What is the relation between the barrel price and the price of gold, exchange rate of USD and inflation in the US? „« What is the different between the different types of the crude oil i.e. Brint, light Arab ¡K Is there any other relevant pieces of knowledge that I have to know . Thanks in advance for your help and wish me good luck ƒº