2 weeks ago I went to Canada for 24 hours and used the $200 exemption(since i was out of country for less than 48 hours). I went to Singapore for 6 days and Tokyo for 2 days since I went to Canada in the last 30 days, does that mean I have $200 duty free or $800? my understanding is $200.

Also I have 2 bottles of commercially packaged orange juice in the luggage, I plan to inform the customs officer of that however will I get a agricultural inspection?