Let's start with solving guesstimates

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Let's begin with first problem

Calculate market size for Number of cars in USA
(Number of people is 300m)

To calculate the market size in terms of the number of cars in the USA with a population of 300 million people, we need to make certain assumptions:

1. Assumption 1: An average ratio of people per car. This ratio varies based on factors like urbanization, wealth distribution, and cultural preferences.

2. Assumption 2: It's common to use the number of licensed drivers or households as a proxy for car ownership.

Now, let's make a simplified calculation with the assumption that the average ratio of people to cars is 2.5 (which means on average, 2.5 people own one car). With a population of 300 million in the USA:

Total number of cars = Population / People per car

Total number of cars = 300 million / 2.5 = 120 million cars

So, based on this rough estimation, the market size in terms of the number of cars in the USA with a population of 300 million people could be around 120 million cars with the given assumption. Remember, this calculation is a simplification and actual numbers can vary based on real-world data and specific demographics.