Give the money to David Copperfield. He has magic powers. .....not.
You can not double any money in a week unless you gamble with it and you are very lucky. You probably won't be and you'll lose most or all of the $50.
Try walking peoples dogs or doing some interior decorating for someone.
When you are 18 you could take part in a medical trial and make $1000 - $6000 depending on the length of the trial. They are usually between 1 week and 6 weeks. I've done about 12 medical trials and never had any side effects.
To do it legally, you probably need to buy and sell stuff a couple times around to turn that much profit, it's hard to actually collect the money through an internet business within 1 week, you also face an obstacle being under 18.
Sell your game machine.
You need a minimum of five $10 jobs, or a few babysitting jobs.
There is no easy or guaranteed way to double your money. You need to look seriously at your work skills and get to work. Any retail job would get you $50.
it's never easy doubling your money
Get a job.
