# of new cases of a specified disease in a population / population at risk for getting the disease
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prevalencerefers to the number of cases of disease thatexistsin a population and the incidence refers to the number of new cases of diseaseoccurringin a population.
Incidence rates vary between 25 and 50 per 100,000 persons.
The noun 'incidence' has many synonyms. A few of them are: frequency, percentage, prevalence, proportion, tendency, commonness, trend and extent. The meaning of incidence is the rate or frequency of which something occurs.
example for cumulative incidence(Risk)...... Number of new cases/Population at risk 28 patient in two years/1000 person at risk which means 2.8% the IR for the same example 14 patient / 1 year
The answer for rate in simple interest is =rate= simple interest\principle*time