document.write( "Question 1134142: If the sales tax on a $60 purchase is $3.90, what would it be on a $240 purchase? \n" ); document.write( "
Algebra.Com's Answer #751438 by Boreal(15235)\"\" \"About 
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60/240=3.90/x
\n" ); document.write( "60x=936
\n" ); document.write( "x=$15.60
\n" ); document.write( "60 is 1/4 of 240 so sales tax at 240 is four times that of 60
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