Explain the solution of the following question

Question- The vice president of operations at Busch Gardens knows that 70 percent of the patrons like roller-coaster rides. He wishes to have an acceptable margin of error of no more than +/- 2 percent and wants to be 95 percent confident about the attitudes toward the "Gwazi" roller coaster.

Part 1- What sample size would be required for a personal interview study among on-site patrons?

I want assist to describe the personal interview study among on-site patrons.