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You need to work on your English before you delve into Mathematics.
I don't even think you know what you fucking asked...
When you say "If 30% off is $13.00, what is the full price", that means that the new price after a 30% discount is $13.00, which made the original price $18.57.
Try to stay with me here:
Off = subtract
is = equals
so what you asked was basically "If Subtracting 30% = $13.00, what was the full price?"
If you wanted the answer to be the 43.33 your question should have been "30% OF the full price is $13.00, what is the full price?"
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