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100$ is so much low amount but I can give advice you to invest 100$ in steemit for buying steem dollars .because steemit is a platform you can earn money by writing blog and also for that we get upvotes in steem dollars.
The perfect choice for business is to invest your 100$ in steemit and start writing blog and people will give upvote also rather than that you can answer the question in musing.io and you will get upvote from musing community and the earning will be directly transferred into your steemit account.
If you want to start private business then you will face various problems and also the amount you have is too low to start a good business. my best regards to you to invest in steemit and save it for few months and see the result.