How do I calculate the duty-free limit when I buy things from Japan?

I have things to buy from Japan, and I think it will be about 700 dollars if I ask my friend to pay for it.

I think the tax will be over 600 dollars, so I was wondering how it would be calculated.

Is it 700 dollars?

Or 700-600=100? Does it come out about 100?

How do I calculate the duty-free limit?

1409 2018-03-11 Lady

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