Platinum Gym has $10,000$ gym members out of which $1,500$ memberships included Unlimited Fitness Training and use of the lap pool, and out of which $750$ included Unlimited Hydromassage. If the Fitness Training is considered A$,$ the use of the lap pool is considered B$,$ and the Hydromassage is considered C$,$ then the associate rule for these sales becomes $"$If A and B are purchased, then C is also purchased." Calculate the confidence level.