Task: Question Answering
Input (English): Passage: A resident of Chennai is called a Chennaite. According to 2011 census, the city had a population of 4,646,732, within the area administered by the Municipal Corporation; that had 11 lakh households, with 51% of them living in rented houses. The citys limits were expanded later in 2011 and its population reached 7,088,000 with Chennai Municipal Corporation being renamed as Greater Chennai Corporation.  Tamil people form the majority of Chennais population. Indian English is spoken largely by white-collar workers, often mixed into Tamil. In 2001, out of the 2,937,000 migrants (33.8% of its population) in the city, 61.5% were from other parts of the state, 33.8% were from rest of India and 3.7% were from outside the country. As per the 2001 census, the number of speakers mother tongue wise are as follows, Tamil language is spoken by 3,424,107 (78.8%), followed by Telugu language by 419,209 (9.7%), Urdu by 180,245 (4.1%), Malayalam by 113,828 (2.6%), Hindi by 104,084 (2.4%), and Kannada by 22,250 (0.5%). Chennai, along with Mumbai, Delhi and Kolkata, is one of the few Indian cities that are home to a diverse population of ethno-religious communities. Minorities include Telugu people, Marwaris, Gujarati people, Parsis, Sindhi people, Odia people, Goans, Kannadigas, Anglo-Indians, Bengali people, Punjabi people, and Malayalees. As per the religious census of 2011, Chennais population was 80.7% Hindu, 9.5% Muslim, 7.7% Christian, 1.1% Jainism, 0.1% Sikh, 0.1% Buddhist, 0.1% following other religions and 0.8% following no religion or did not indicate any religious preference. 
Question: How many people, in terms of percentage of the population, are either Muslim or Christian in Chennai? 
Answer type: Number 
Output (English): 17.2.