The purchase price according to her receipt indicates $12.00 and $15.00 respectively. Hence, turning them both in a day implies that both are put for sale that day.
In order to determine the amount Susan will owe, one needs to add the two purchase price together and have the amount. Consequently, $12.00 plus $15.00 will amount to $27.00.
Therefore, the correct answer is option C. $27.00
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