1. Which one of the following is true: For a refinery to be viable in the long term net cash margin must be lower than capital cost variable margin must remunerate only capital cost net cash margin must be able to remunerate all types of capital cost net cash margin must be able to remunerate only sustaining capex 2. Which one of the following is true: Working capital can be depreciated Sustainability capital cannot be depreciated Replacement capital cannot be depreciated Both sustainability and replacement capital can be depreciated 3. Which one of the following is true: For a refinery from a working capital cost point of view having receivables is positive having cash in hand is positive having inventories is positive having payables is positive 4. Which one of the following is true: ROCE (Return On Capital Employed), ROI (Return On Investment) are competitiveness KPI's calculated in a yearly basis. competitiveness KPI's calculated along the whole life of a project. investment attractiveness KPI's calculated along the whole life of a project. investment attractiveness KPI's calculated in a yearly basis