Question

The Milky Way Galaxy is 100000 light years across. The Sun is located about 30000 light years from the galactic center and revolves around it with a period of 2e8 years. All the stars inside the sun's orbital radius is to be concentrated at the galactic center, as if they were combined into one gigantic star.
What is the mass of the galactic center? knowing 1 light year=9.46e15m and the mass of sun is 1.99e30kg. How many of our suns is this equivalent to?

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