Farmer Sam is supplying corns in a perfectly competitive market. In Year 1 he sells 3000 tons of corns at a price of $150 per ton. In Year 2 he sells 3600 tons at $200 per ton. In Year 2, his average revenue is ________ and her marginal revenue is ________.
A) $20; $18
B) $150; $200
C) $200; $200
D) $150; $150