You can start investing with as little as $1 through micro-investing apps, which allow you to purchase fractional shares of stocks and ETFs.

Historically, the S&P 500 has had an average annual return of around 7-10.5% when adjusted for inflation over the past 5-20 years.

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Investing your $100 in a mutual fund or ETF that tracks the S&P 500 index can potentially yield an average annual return of 7-10.5%.

You can invest in yourself by purchasing books on investing or business ownership, which can help you grow your skills and net worth.

If your employer offers a 401(k) match, contributing $100 can earn you an immediate 100% return on investment.

You can earn interest with a high-yield savings account, which typically offers a much higher interest rate than a standard savings account.

Buying stocks in companies with a history of steady growth and dividend payments can provide a regular source of passive income.

A robo-advisor is an affordable way to start investing, with lower fees than traditional investment advisors and minimal account minimums.

You can invest in a child's education by starting a 529 plan, which grows tax-free and can be used for qualified education expenses.

You can start an emergency fund with your $100 investment, providing financial security in the event of unexpected expenses.

By paying off high-interest debt, such as credit card debt, you can potentially earn a higher return on investment than can be achieved through traditional investment methods.

Diversification is a key investment strategy, which involves spreading your investments across various asset classes to reduce risk.

Investing in real estate, whether through property ownership or real estate investment trusts (REITs), can be a profitable investment strategy.

You can purchase individual stocks in companies with a promising future, but this strategy carries a higher degree of risk than investing in mutual funds or ETFs.

You can start a brokerage account and use it to trade individual stocks, options, and other securities.

Investing in bonds, which are essentially loans to a government or corporation, can provide a relatively stable source of income over a fixed period of time.

Cryptocurrency, such as Bitcoin, is a highly volatile investment that can provide high returns, but carries a high degree of risk.

Peer-to-peer lending platforms allow you to loan money directly to borrowers, providing an alternative investment option to stocks and bonds.

Mutual funds that specialize in socially responsible investing allow you to invest in companies that align with your values.

You can use an investment return calculator to estimate the potential return on investment for your specific investment strategy.