Direction - Study the given information carefully to answer the questions.

Every year, the Health Department conducts a survey of 1000 people. According to the survey in the year 2015, 2016, 2017, 2018 and 2019, the percentage of people affected by Dengu were 40%, 20%, 45%. 25% and 30% respectively. Health Department also found that every year out of the affected people 70% were students, 10% housewives and 20% were employees. The number of students, housewives and employees were in the ratio of 20 ∶ 11 ∶ 9 every year.