f 10% of the stars are of suitable type for life to develop, 30% of all stars ha

Question

f 10% of the stars are of suitable type for life to develop, 30% of all
stars have planets, and 20% of planetary systems have a planet or moon at
a suitable distance from the star so liquid water can exist, calculate the
fraction of stars that have a
planet suitable for life. Then use the fraction: if the Milky Way has
200,000,000,000 stars, roughly how many such stars would there be in our
galaxy?

Answer: X
Just give a whole number. Use no words or units.
Do not use scientific notation. Just use an integer. Use no commas.
Examples:

Explanation / Answer

fraction of stars that have a planet suitable for life = 10% of 30% of 20% of 200000000000

                                                                               = 0.1 x 0.3 x 0.2 x 200000000000

                                                                               = 1200000000

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