Can someone explain this step by step in excel (if you could attach the excel document so I can see the formulas that would be great)

A shipping company with MAR 12%, is deciding whether to use newly developed electric trucks instead of conventional trucks. This upgrade has the following costs and benets : $1,000,000 investment to buy new trucks Savings from converting to electric trucks include $35,000 per year on fuel and maintenance. Buying electric trucks will increase the customer base by 5,000 new customers each year. Each customer has a benet of $40 per year Conventional trucks have a total salvage value of $200,000 Electric trucks have a total salvage value of $150,000 Do nothing is a feasible alternative. Assume the planning horizon to be 10 years. Determine the best alternative using: a) IRR b) ERR