A company exported goods to Canada. The goods were sold at USD 500 per M/T CIF Vancouver, including the freight of USD 70 and the premium of USD 6.5. If the purchasing cost was RMB 1800 per M/T and domestic and indirect charges was roughly estimated by 8% of the purchasing cost. VAT rate was 17% while export rebate rate was 5%. The exchange rate issued by the bank is USD1: RMB 6.46. Please calculate (1) total export cost, (2) export revenue, (3) ECFE and (4) profit and loss ratio in export