A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 7% margin of error at a 95% confidence level, what size of...

A political candidate has asked you to conduct a poll to determine what percentage of people support him.
If the candidate only wants a 7% margin of error at a 95% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places.