Need to fix database and improve

We have a Spreadsheet already however this needs fixing and amending to have a conclusion page. We are an Electric Vehicle Charger business, we need to show our customers how much they would make on opening a ‘Pay to use’ EV Charger facility and also the return on investment from their initial investment including the installation and purchase of the EV chargers. Once the spreadsheet is fully working, we would only be required to input the basic information to generate the end report for the customer as the SS would work everything else out. We will need a ‘final presentation page’ which will have our logo on and our company information, showing all the relevant information to present to the customer. A sample spreadsheet with missing formulars is available for you to work off and to gauge what we are wanting.