can someone help on this problem

Read the following and answer the questions that follow Imagine that there were 20,000 people living in a city on Sep 1 through Sep 30, 2020. . Since the beginning of the COVID-19 pandemic, up until Sep 1, 2020: a total of 500 people had tested positive for COVID-19 in the city . Since the beginning of the COVID-19 pandemic, up until Sep 30, 2020: a total of 650 people had tested positive for COVID-19 in the city. (These 650 includes all 500 people who had already tested positive by Sep 01) a. Compute the incidence proportion (aka cumulative incidence) of COVID-19 in the city from Sep 1, 2020 through Sep 30, 2020. Please show the steps. (2) b. Describe how you would interpret this incidence proportion (computed in a) for someone not familiar with these epidemiological concepts. (2) [You will not receive any credit for answers such as, "I would explain by saying that the incidence proportion of COVID-19 in the city is ..%". This is a restatement, not an interpretation. ]