Help. I need answer for this one. Clear an detailed solution pls. Thank you

Topic: Probability Sampling Technique

NEED COMPUTATION ON DETERMINING THE SAMPLE FOR 1%, 5% AND 10% Margin of Error

Due to the pandemic that we are experiencing right now, a researcher (w/ IATF permit) aims to determine the health status of the senior citizens in a certain municipality. The barangays in the municipality have a total population of 11, 926 senior citizens, Determine how many senior citizens will constitute the sample if the margin of error is 1%, 5%, and 10% respectively. Which among these confidence levels is the most reliable and valid to represent the population? And Why