if I have $1000 and I bought red balls for the price of $1.872 to have 534.18 red balls
mathematically: case one: how can keep the amount of $1000 the same if the ball price decrease less than $1.872 by increasing the number of the balls by giving free balls
case two: how can keep the amount of $1000 if the ball price increase more than $1.872 by decreasing the number of the balls.
What are the mathematical equations that show the balance between the two sides to maintain $1000 as it is during the rise or fall?
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