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The correct answer is 537
From the problem :

In multiplying expressions with the same bases, the exponent will be added accordingly.
For example :

the exponent of a are m and n, and the product will be a raised to the sum of m and n.
Applying this to the problem, we have :

The answer is d. 6^-1
New annual renter's insurance premium = 325(1 + 0.18) = 325 x 1.18 = $383.50