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%.
Wisconsin has a statewide sales tax rate of 5.00%, which has been in place since 1961. Municipal governments in Wisconsin are also allowed to collect a local-option sales tax that ranges from 0.00% to 0.60% across the state, with an average local tax of 0.44% (for a total of 5.44% when combined with the state sales tax). The maximum local tax rate allowed by Wisconsin law is 0.60%.