Please show how to solve using excel

Exxon-Mobil is planning to sell a number of producing oil wells. The wells are expected to produce 100,000 barrels of oil per year for 8 more years at a selling price of $28 per barrel for the next 2 years, increasing by $1 per barrel through year 8 . How much should an independent refiner be willing to pay for the wells now, if the interest rate is 6% per year