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Neither I, nor anyone else can tell you how to definitely "double your money". All investment carries risk. With any hope of reward, comes a monetary risk. It also depends on your time frame. You stick it in an online savings account, you could double your money. It'd take a long, long, long while, but it could be done eventually.
I assist the low-funded understand what they need to consider before investing their money. But even I would state that $210 is just too little. My minimum I tell folks to try, is to start with $500, and then add in $100 a month.
Your best bet is to stick it in an online account. It's too little money to truly invest with, as your cost basis would be too high. So you might as well earn some interest on it.
With $200, you should be able to buy 5 domain names, host them, put up wordpress on them, and write 30 articles for each. If you're diligent, you can do this all in a month. Each blog should be worth $200 or more, earning you $1000 on your $200. But there's a bit of effort involved.
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