2.31 NMTeX Oil owns several gas wells in Carlsbad, NM. Revenue from the wells has been increasing according to an arithmetic gradient for the past 5 years. The revenue in year 1 from well no. 24 was $390,000 and it increased by $15,000 each year thereafter. Determine (a) the revenue in year 3, and (b) the equivalent annual worth of the revenue through year 5 . Assume an interest rate of 10% per year