<prompt> In a population of 5000, incidence of disease is 100 in 1 year duration of disease studied for is 2 years calculate Prevalence -2010004010008010004001000  <response>: Incidence No. of disease person Population at risk x 1000 1005000 1000 20 per one thousand per year Prevalence I x D 20 x 2 40 per one second 