The number of stars range between 6 * 10^9 stars and 1.2 * 10^10 stars.
We know that a galaxy is composed of many stars. The stars in the galaxy as we saw from the question, using the milky way as a template may have between 200 and 400 billion stars.
The number of stars could be obtained as the product of the number of galaxies and the number of stars in the lower and the upper limits.
Number of stars in the lower estimate = 200 * 10^6 * 30 = 6 * 10^9 stars
Number of stars in the higher estimate = 400 * 10^6 * 30 = 1.2 * 10^10 stars
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