75 billion refers to a quantity of something. Without more context, it is difficult to determine what specifically is being referred to. It could be a measure of currency, a population, a number of objects, or any other measure.
I'm sorry, but I need more context or information in order to provide a step-by-step explanation. Are you referring to a specific topic or calculation? Please provide more details so I can assist you better.
It seems you have entered "75 billion" without any context or specific question. Please provide more information or ask a specific question so that I can assist you better.
