I need help finding the return time, Net present value and internal rate of return for both. Please show me the formula on how to calculate. Thank you

2 possible investments. Ordering from Japan to Spain. Transit time 2 months (60 days) sea shipping. Payment. 50% before shipment, 30% once the goods arrive and 20% 1 month (30 days) after arriving. 1. Total investment 25,000$. Shipping costs 8,000$. Sales, 7,500$ per month (total income 40,0008), once the goods arrive. 2. Total investment 50,000$. Shipping costs 13,000. Sales 8,000$ per month (total income 80,000$), once the goods arrive. Calculate the return time for both, the NPV and the IRR. As said consider the actual inflation rate to calculate de IRR 2 possible investments. Ordering from Japan to Spain. Transit time 2 months (60 days) sea shipping. Payment. 50% before shipment, 30% once the goods arrive and 20% 1 month (30 days) after arriving. 1. Total investment 25,000$. Shipping costs 8,000$. Sales, 7,500$ per month (total income 40,0008), once the goods arrive. 2. Total investment 50,000$. Shipping costs 13,000. Sales 8,000$ per month (total income 80,000$), once the goods arrive. Calculate the return time for both, the NPV and the IRR. As said consider the actual inflation rate to calculate de IRR