Tourist Trouble

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On the last day of his trip, a tourist from Paupa New Guinea wanted to buy a $7 vase from my shop. However, he ran out of Australian dollars and only had Paupa New Guinean coins--both circular and triangular--with him. The exchange rate on that day was that 7 circular coins were worth $6 and 7 triangular coins were worth $11.

Would he be able to pay for the vase without requiring change from me?

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