Quadri-, quadru-, quadr-is a Latin prefix related to the verb quadrare âto make squareâ, quadratus âsquareâ etc. Quad is simply an English shortening of quadrangle, quadruplet etc. So quadri-and quad are actually the same word.
Seattle, WA Sales Tax Rate. The current total local sales tax rate in Seattle, WA is 9.600% . The December 2014 total local sales tax rate was 9.500% .
5.75%. The District of Columbia state sales tax rate is 5.75%, and the average DC sales tax after local surtaxes is 5.75%. Washington, DC recently lowered the district sales tax by a quarter of a percent from 6% to 5.75%. The District of Columbia's sales tax is imposed on all sales of tangible property as well as on certain services.