definiens: shall mean, for the current Pricing Period commencing after the first anniversary of the First Commercial Sale, the amount ( calculated in accordance with Section 6.1.7 ) equal to the sum of ( a ) the product of ( i ) the [ total number ] during the applicable Measurement Period of [ individual unit tests ] of BNP Assays sold to [ end user customers ] located within the [ United States ] ( [ ] ), divided by the [ total number ] during the applicable Measurement Period of [ individual units tests ] of BNP Assays sold to [ end user customers worldwide ] ( ] ), times ( ii ) the US Purchase Price for the current Pricing Period, plus ( b ) the product of ( i ) [ World Assay Sales ] minus [ US Assay, Sales ] ( [ ] ), divided by [ Worldwide Assay Sales ], times ( ii ) the Foreign Purchase Price for the current Pricing Period . The foregoing calculation is set forth as a formula as follows : Worldwide Purchase . Price = reUS Assay SaleslWorldwide Assay Sales ) ] x US Purchase Price -?f : ' + [ ( Foreign Assay Sales/ Worldwide Assay Sales ) ] x Foreign Purchase Price - * 2 . REPRESENTATIONS AND WARRANTIES Each party hereby represents a : p.d warrants to the other party as follows : 2.1 Corporate Existence . Such party is a corporation duly organized, validly existing and in good standing under the laws of the state in which it is incorporated