Doxycycline is used for malaria prophylaxis or treatment. When it is administered for treatment of P falciparum malaria, this drug must be used as part of combination therapy (eg, typically with quinine or quinidine).
If you buy goods and are not charged the Rhode Island Sales Tax by the retailer, such as with online and out-of-state purchases, you are supposed to pay the 7% sales tax (less any foreign sales tax paid) for these items yourself as the Rhode Island Use Tax.
Since State X has a sales tax rate less than the 6.25 percent Massachusetts rate, you owe a use tax in Massachusetts of $31.50 - $87.50 (6.25 percent Massachusetts sales tax obligation) minus $56 (4 percent State X sales tax payment).he sales tax on boats and recreational vehicles purchased from a Massachusetts dealer is collected by the dealer at the time of sale. For casual sales, the sales/use tax is due prior to registration or by the twentieth day of the following month, whichever occurs earlier.