Given:
Cost of Jacket = $30
Tax rate = 6% = 0.06
Let's write an equation that represents the total cost, c, of any item bought in Idaho at a price, p.
To write the equation, apply the formula:

Where:
a is the cost of the item
r is the tax rate
y is the total cost.
Thus, to write the equation which represents the total cost, we have:

Therefore, the equation is:

ANSWER:
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