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OpenStudy (anonymous):
the sales tax on a $100 purchase is $15. how much would the sales tax be on a $40 purchase? Must use a proportion to solve.
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OpenStudy (mathstudent55):
sales tax/purchase = 15/100 = x/40 Solve the proportion 15/100 = x/40 for x. Cross multiply to get started.
OpenStudy (anonymous):
What numbers do I multiply?
OpenStudy (mathstudent55):
Math is meant to be done on paper using proper fractions with proper horizontal fraction lines, not slashes. See pic below. |dw:1362090628763:dw|
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