If sales tax is 9%,what is the tax on a sale of $3,000?

We can use proportion to solve this problem.

$ 3000 --- 100%

$ x       ---    9 %

x = (3000*9)/100 = 270

Sale tax is $ 270.

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step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2