The state House of Representatives has passed a bill that extends the 4% tax on the sale of mixed drinks in Arkansas. The mixed-drink tax is currently set to run out in 2007. The bill that passed the House would extend it indefinitely. The tax was originally put into place six years ago, and the money is meant to help pay for research facilities at the University of Arkansas for Medical Sciences. The center should have paid off its $20 million loan by 2007. But lawmakers decided to keep the tax in place beyond that period, giving future legislators a chance to work with that source of funding for some other use.