The Net Present Value exercises are targeted for students first encountering this topic, usually in their 1st or 2nd year undergraduate studies. When you click on a logo, you are provided with a unique excel file, with a solution. Make sure you save the exercise as it is not possible to regenerate the same exercise twice.
The exercises give students good training in generating a relevant cash flow, calculating the NPV and Internal Rate of Return. As everything is based on Excel it also gives you a good opportunity to drill your spreadsheet abilities.