How much does a personal trainer cost? Can a teen afford one? Are they worth it?

I'm a 16 year old girl really wanting to lose weight and get in shape. I'm 5'2 and weigh 158 lbs. I want to lose about 40-50 lbs during the summer, I don't have a job yet but I'll be getting one this summer, how much would one cost? Please help
How much does a personal trainer cost? Can a teen afford one? Are they worth it?
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