How can you get % of body fat after you have lost 100 pounds?

I started with a local gym last week and they measured my body fat with a computer of sorts by putting in my weight and etc. I still have 30 pounds to lose, but I am in a size 12 and 10. I have some hanging skin, but the computer came up with 47% of body fat, this cannot be right. My hip and rib bones show. What can I tell them , to get them to understand the loose skin from the weight loss. Or do you know if this can be possible. Thanks, Annie

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