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.
The Washington state sales tax rate is 6.5% , and the average WA sales tax after local surtaxes is 8.89% 1  . Groceries and prescription drugs are exempt from the Washington sales tax. 2  Counties and cities can charge an additional local sales tax of up to 3.1%, for a maximum possible combined sales tax of 9.6%.
Exact tax amount may vary for different items. Download all Washington sales tax rates by zip code. The Grant County, Washington sales tax is 7.90% , consisting of 6.50% Washington state sales tax and 1.40% Grant County local sales taxes.The local sales tax consists of a 1.40% county sales tax. The Grant County Sales Tax is collected by the merchant on all qualifying sales made within Grant County.