Final answer:
The total rental cost is a. $732.
Step-by-step explanation:
To find the total rental cost, we need to calculate the cost of renting one computer for one month and then multiply that by the number of computers and the number of months.
The cost of renting one computer for one month is $64. With a tax rate of 6%, the tax on the rental cost would be 6% of $64, which is $3.84.
So, the total cost of renting one computer for one month, including tax, is $64 + $3.84 = $67.84.
Since four computers are rented for three months, the total rental cost would be $67.84 × 4 × 3 = $815.04.
Therefore, the correct answer is option a. $732.