Marą purchased a cell
phone for $30. this amount
includes a 6% sales tax. what
was the cost of the item
before tax?

$28.30✔️

Step-by-step explanation:

Let C = cost before tax

Cell phone costs = C + C·6% = $30

C(1 + 0.06) = $30

C = $30/1.06 = $28.30

$28.30✔️

Verify

Cell phone after tax = $28.30 + $28.30·6/100 = $28.30 + $1.70 = $30✔️

Spymore  

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