Total cost = 200 + extra cost paid for the 10 classes
= 200 + 10 + 10 + 10 + 10 +10 + 10 +10 + 10 + 10 + 10 = $300
Average cost of the 10 classes = Total cost / number of classes
= 300/10 = $30
Therefore, the average cost if you go to 10 classes = $30.
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