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.
Washington does not allow local jurisdictions like cities or counties to collect a local sales tax. The Washington state sales tax of 6.5% is applicable statewide. You can view the sales tax rates for various cities in Washington here.
Effective July 1, 2010 the individual tax rate is 1.5% for residents and 0.75% for nonresidents. The corporation tax rate is 1.5%. Prior to July 1, 2010, the individual tax rate is 1.3% for residents and 0.65% for nonresidents. The corporation tax rate is 1.3%.