pls help this is rush

Question 11 & Points In 2012, a teacher conducted a survey with 50 randomly selected college professors to know their average annual income. From the same study, it was found that the population standard deviation of their income is at 60,000 pesos. Ten years after, they would like to replicate the survey among all active college professors and estimate the present average annual income at 99% confidence. If their region would like to estimate the actual average income of college professors within a 10,000-peso margin of error, how large a sample size should they consider? Supply the number only. Round off your answer in the nearest digit. Blank 1 Blank 1 Add your