Sampling 2.4 Confidence intervals

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Confidence Intervals
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The masses, in grams, of certain potatoes are normally distributed with known population
standard deviation but unknown population mean. A random sample of potatoes is taken in
order to find a confidence interval for the population mean. Using a sample of size 50, a 95%
confidence interval is found to have width 8 grams.
(i) Using another sample of size 50, an !%confidence interval has width 4 grams. Find !.
(ii) Find the sample size n, such that a 95% confidence interval has width 4 grams.

can you please help me solve these?

hibarehman