If I loan you 10 dollars at 50% interest rate and then you use the 10 dollars to buy a product I am selling and you proceed to make $11 billion dollars with tha

If I loan you 10 dollars at 50% interest rate and then you use the 10 dollars to buy a product I am selling and you proceed to make $11 billion dollars with that product, you just made $11 billion dollars from $10 investment and I made $5 - not bad