Sales tax is directly proportional to cost. If the sales tax on a 46000 automobile is $240, what is

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Sales tax is directly proportional to cost. If the sales tax on a 46000 automobile is $240, what is the sales tax on a $9000 automobile?

Set up a proportion of sales tax to purchase price where s is the sales tax on a 9000 automobile:
240/46000 = s/9000

Typing this proportion into our search engine and we get:
s = 46.96