The point F tells us that Marcelina spends the intended amount of money and she buys more than the intended amount of corn.
From the question the entire kg of maize that she buys from what we see in the graph is
50 + 20 = 70kg
But the amount that she was supposed to buy is 50 kg
Hence the point F shows that she spent the money the way she wanted to use in to buy the product.,
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