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% .
1 This is comprised of a 5.82 percent federal rate and an average 11.23 percent state-local tax rate. 2  The five states with the highest state-local rates are: Washington State (18.6 percent), Nebraska (18.48 percent), New York (17.74 percent), Florida (16.55 percent), and Illinois (15.81 percent).