What is the Top down approach for market estimation?

A startup in India is planning to launch a new line of vegan protein bars and wants to estimate the potential market size in their city.

The city's total population is 5 lakh (500,000). Based on a recent health and wellness report, 30% of the city's population is interested in health foods. Additionally, a survey on vegan lifestyles indicates that 20% of those interested in health foods specifically seek vegan products.

Using the top-down approach, what is the estimated market size for vegan protein bars in this city?

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