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200. would be 3 sig figs, but, if it were just 200 without the decimal then it would only be 1 sig fig. 200. is not the same as 200.0 because then that would be 4 sig figs since the zero does count after the decimal.
If your answer is 200 and need to write your answer in 3 sigfigs you can write 200, but if the lowest given value from the question has 4 sigfigs you would need to answer in 4 sigfigs as well. You would write 200.0 which has 4 sigfigs.
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