9. Capex dollars per bbl of crude required to build a refinery are on the order of 100,000 to 500,000 USD/bbl 50,000 to 100,000USD/bbl 5,000 to 10,000USD/bbl 10,000 to 30,000 USD/bbl 10. Which one of the following is true: Incremental Coking return on capital is lower than Hydrocracking returns Incremental Coking return on capital is lower than Hydrocracking + Coking returns Incremental Coking return on capital is negative Incremental Coking return on capital is higher than Hydrocracking + Coking returns 11. Which one of the following is true: Incremental coking return correlates with Hydrocracking returns Incremental coking return on capital correlates with Diesel-Gasoline differentials Incremental coking return correlates with Hydroskimming margins Incremental coking return on capital correlates with Diesel-HSFO differentials 12. Sustaining capital is needed for ensuring minimum cost of production having a cash reserves to deal with unplanned shutdowns building new units, do revamps and complain with regulatory rules beducing inventory costs