Keaton has a farm of oranges and apples. He can harvest his oranges every 2 months and can sell the harvest for $50. He can harvest his apples every 3 months and can sell this harvest for $30. How much money can Keaton earn every year? Let's think first. Chain of thought:
Keaton can harvest his oranges every year is 12 / 2 = 6 times. So the total money he earns for his oranges every year is $50 x 6 = 300. He can harvest his apples 12 / 3 = 4 times in a year. So the total money he earns for the apple in a year is $30 x 4 = 120. Therefore, the total money he earns for his oranges and apples is $300 + $120 = $420.
Therefore, the answer is 420.