A six-year operating lease requires annual rent payments of $15,000 for years 1, 2, and 3, and annual rent payments of $10,000 for years 4, 5, and 6. The agreement also requires the lessor to pay a $2,800 annual insurance premium for the leased property. Which of the following amounts should be recognized as the rental revenue in year 1 by the lessor? $10,000 $16,800 $13,500 $15,000