I need to see a step-by-step process to find the correct answer because I am not understanding how this is done by looki

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I need to see a step-by-step process to find the correct answerbecause I am not understanding how this is done by looking atothers' work on here.
A study conducted several years ago reported that 23 percent ofpublic accountants changed companies within 2 years. The AmericanInstitute of CPAs would like to update the study. They would liketo estimate the population proportion of public accountants whochanged companies within 2 years with a margin of error of 2% and a98% level of confidence. (Use t Distribution Table & zDistribution Table.) (Round your z-value to 2 decimals. Round upyour answers to the next whole number.)
Required:
a. To update this study, the files of how many publicaccountants should be studied?
b. How many public accountants should be contacted if noprevious estimates of the population proportion are available?