1. In January 2010 you began a one-year study of malaria in a subsidized housing community in Malabon City. You enrolled 500 residents in your study and checked on their malaria status on a monthly basis. At the start of the study, you found that 10 of the residents were positive for malaria and 20 residents were actually vaccinated immigrants. Another 30 residents screened positive for malaria in the months ahead. As an epidemiologist, you want to know the following (expressed in 2 decimal places and per X population when applicable):

A. What is the point prevalence of malaria in the screened community on January 1st?

B. What is the period prevalence of malaria in this community in the year 2000?

C. What is the cumulative incidence for the one year period?