As per provisional reports of Census India, population of Dehradun in 2011 was 578,420; male and female are 303,411 and 275,009 respectively. The sex ratio of the city is 906 per 1000 males. The number of literates in Dehradun city is 463,791, of which 251,832 are males and 211,959 are females. Average literacy rate of Dehradun city is 89.32 percent, whereas male literacy and female literacy rates are 92.65 and 85.66 percent, respectively. The number of children of age under six in Dehradun city is 59,180 as per figure from Census India report on 2011. There are 31,600 boys and 27,580 are girls. Child sex ratio of girls is 873 per 1000 boys.. How many percent of people were not literate in Dehradun city?