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Opportunity cost question

Hey,

Theres this question which I can't seem to get the answer to. I mean I know what oppotunity cost is. But I don't know how to get to the answer here.

QUESTION

PPF.jpg

The Diagram refers to an economy producing two goods: cars and computers.

If the economy experiences economic growth the chance in oppotunity cost of producing 500 cars is...

Answer: A decrease of 15 computers.

Can someone please explain to me why the answer is that. I mean I can't figure out the calculations which were used to get to -15 here.

Thank you.
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Before, the computers forgone for choosing producing 500 cars are 525-300 = 225. 525 is the total computers that can be produced without producing any car (all resources used to make computers) and 300 is the amount of computers that can be produced with 500 cars (some resources now taken away to produce 500 cars), so taking the difference is like: you now want to make 500 cars, what are the computers forgone.

Then, you take the difference in the second PPF and then calculate the change in opportunity cost

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