What is the Bottom up approach for market estimation?

A hyperlocal delivery app wants to estimate the market size for free-range eggs in their town. They decide to use a bottom-up approach.

They start by surveying a sample of 100 residents and find that 25 are interested in buying free-range eggs. They then scale up this data to the entire town population of 10,000 residents.

What is the estimated market size for free-range eggs in this town?

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