Final answer:
The total cost of Robert's gym membership for twelve months, including the membership fee and equipment maintenance fee, is $6,335.
Step-by-step explanation:
The total cost of Robert's gym membership for twelve months is calculated by multiplying the monthly membership fee by twelve and adding the one-time equipment maintenance fee. The monthly fee is $525, so for twelve months, that’s 12 * $525 = $6,300. The one-time equipment maintenance fee is $35. Thus, the total cost is $6,300 + $35 = $6,335.
The correct answer is B) $6,335.