You should get at least ten good tomatoes from each of these plants, the man was told. Sounds good, he said, and the sale was made. He took them home to his garden, where he planted them in five rows of four each. It was a good growing year, weather-wise. But when the man finally counted his crop he found it totaled just 159 tomatoes. But the man was greatly pleased. He thought, I'll surely recommend that place to my friends.
Assuming the man had at least a high-school education, explain his reasoning.
Use the spoiler Luke.