SOLUTION: How do you write a function rule to describe the amount of sales tax as a function of the price of an item purchased if the sales taxis 6%?

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Question 424839: How do you write a function rule to describe the amount of sales tax as a function of the price of an item purchased if the sales taxis 6%?
Answer by JoeFourier(1) About Me  (Show Source):
You can put this solution on YOUR website!
First you have to think about how to write 6% in a way that we can understand mathematically.
To do this think of what 6% means. 6% means 6 out of 100. So in fractions we have 6/100 and in decimals we have .06
For a function rule we will use the decimal representation, .06
Now, to solve for the amount of sales tax we have to multiply our tax rate, .06, by the price of the item.
Let x be the price of the item. Then we can call our function f(x).
Since we need to multiply the price by the tax rate we now have:
f(x) = (.06)x