1. A study population of 900 inhabitants there are 50 cases of tuberculosis and 18 cases of hypertension. During the first six months there are 15 new cases of tuberculosis
and 6 new cases of hypertension. At the end of the year the total of new cases is 25 for
tuberculosis and 11 for hypertension. During the same period, 6 new cases of
tuberculosis died and 6 were cured. In the same period, 3 cases of hypertension died
and no case of hypertension was cured. Calculate the following rates
A. Prevalence rate at the beginning of the study
B. Incidence rate of tuberculosis and hypertension at the end of the first six months
C. Incidence rate of tuberculosis at the end of the year
D. Prevalence rate of tuberculosis and hypertension at the end of the year