document.write( "Question 1170953: a. State sales tax S is directly proportional to retail price p . An item that sells for 180 dollars has a sales tax of 10.22 dollars. Find a mathematical model that gives the amount of sales tax S in terms of the retail price p .
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\n" ); document.write( "\n" ); document.write( "b. What is the sales tax on a 350 dollars purchase. Round to the nearest cent. \r
\n" ); document.write( "\n" ); document.write( "The sales tax on a 350 dollar purchase is $
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Algebra.Com's Answer #796148 by Boreal(15235)\"\" \"About 
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S(p)=k*p
\n" ); document.write( "10.22=180*k
\n" ); document.write( "k=0.0568
\n" ); document.write( "S(p)=0.0568*p after rounding
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\n" ); document.write( "350*0.0568=$19.87
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