If the proportion of people who intend to vote Democratic were to be estimated at a 95

Question:

If the proportion of people who intend to vote Democratic were to be estimated at a 95 percent confidence level, what sample size should be taken
a. If the accuracy is to be ±0.01 (or one percentage point)?
b. If the accuracy is to be ±0.03?
c. If the accuracy is to be ±0.06?
d. Repeat the above for a 90 percent confidence level.