Answer:
$1800
Explanation:
If the Smith family opted for an installment plan with 12 monthly payments of $150 each, the total cost of the carpet would be the sum of all the monthly payments.
So, the total cost of the carpet was $1,800.
$1,800
If the Smiths agree to the installment plan and pay $150 every month for 12 months, it will add up to $1,800 at the end of the year.
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