Hi there. Here's some extra guidance, hope it helps:
You need to calculate the effect on profitability of implementing each of the options you are asked about and not to calculate the actual updated profit after the option has been implemented. You also need to download the data in the spreadsheet to see the pre and post-MEXIT P/L account figures, and use these as the basis for your answers:
You should be drawing on your management accounting skills, specifically cost-volume-profit (CVP) techniques where you are analysing effect on profits based on changes to revenues, variable costs and fixed costs.