Starting a business in Ghana with $100 requires creativity and resourcefulness.

Here are three potential business ideas:

1. *Sachet Water Sales*: Package water in sachets and sell them in busy areas like markets, bus stations, or outside schools. Initial investment: $100 (water, sachets, and a cooler).

2. *Phone Charging Service*: Offer phone charging services in public areas like markets or transportation hubs. Initial investment: $100 (charger, cables, and a power source).

3. *Fresh Fruit Sales*: Buy fresh fruits from local markets and resell them in busy areas or to street vendors. Initial investment: $100 (fruits and a basket or cart).

Keep in mind that these ideas require hard work, dedication, and a willingness to learn and adapt. Additionally, ensure you comply with local regulations and laws.

Remember, starting small and scaling up is a great way to build a successful business. Good luck!