Brett is joining a new gym. He can join Power Plus or Heavy Hulk. At Power Plus, it will cost $34.16 per month, plus a sign-up fee of $21.00. At Heavy Hulk, it will cost $34.41, plus a sign-up fee of $33.50. Right now, Heavy Hulk is cutting their sign-up fee in half for new members. If Brett signs up at a gym today, after how many months will the cost of the memberships be the same?