If Bill Gates had invested his entire net worth of $40 billion in Bitcoin$BTC in 2009, his gain would be astronomical. Let's do a rough estimate:

Assuming an initial investment of $40 billion in 2009:

Let's do a more detailed calculation:

Initial investment: $40 billion (in 2009)

Assuming an average annual return of 230% (which is a rough estimate of Bitcoin's historical performance):

Year 1 (2009-2010): $40 billion x 230% = $92 billion

Year 2 (2010-2011): $92 billion x 230% = $211.6 billion

Year 3 (2011-2012): $211.6 billion x 230% = $486.38 billion

...

Year 15 (2023-2024): $1.33 trillion x 230% = $3.06 trillion

As of June 2024, his investment would be worth approximately $3.06 trillion.

Please note that this calculation is still simplified, as Bitcoin's price has fluctuated significantly over the years. A more accurate calculation would require precise daily or monthly price data.

Also, keep in mind that this is a hypothetical scenario, and actual investments carry risks and fees that can affect returns.