Help With Equations and Advice for my BTC scenario.

Hello Everyone in this Community.

I will start by thanking in advance to every comment to help me understand this better.

I really believe in crypto, but in this post I will focus in BTC, because this was my first coin that I invested in.

I would like my siblings to understand this as well and that is the major purpose that I am posting in r/CryptoCurrency.

Lots of you might think its High school math, but for some reason I'm really getting confused with numbers and formulas, I searched online but I am still confused regarding the math behind it. Once, I approach my brothers and sisters, I want to have almost every scenario covered in the investment of BTC. Losses, gains, profit etc.

I apologize in advanced if my vocabulary is not the correct one.

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My questions are:

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What is the formula to know how much dollar value I have in BTC on any market value 25k 35k 47k and so on?

(I told my siblings to invest when BTC was in 27K, and once it reaches 60k you would have more than the $10 dollars you invested, ofcourse these numbers are just example so we all can understand it better.)

If I invested 10 dollars when it was 27K, how much would I have when it reaches 60K?

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I invested 1000 dollars in BTC, 100 when it was around 60k, 200 when it dropped to 52k, 300 when it was around 41k and 500 when it was around 29k. I know I have 1000 invested in BTC just for myself. When BTC hit 30k I invested 10 dollars on each sibling, 50 dollars in total, but all the BTC I own is together and I want to create a wallet for each one of my siblings and send them their 10 dollars worth of BTC in today's market value which is 12/14/2023 BTC is at $43,500.00. That way they can actually see how BTC grew a bit, and the more they invest the better. The more they can invest to grow their portfolio maybe the more than can actually invest in it.

What would be the correct equations for my personal scenario that I wrote above?

I really hope I can find the answer to maybe an easy questions for you crypto veterans.

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Blessings and Abundance to you all.

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