In 2011, the population of a town was 5,00,000 and the number of housing units were 1,00,000. Calculate the additional number of dwelling units (DU) required by 2031 so that there is no housing shortage. The assumptions are
i. 5% decadal increase in population
ii. New DU to be completed by 2021 is 10,000
iii. N umber of DU which will become non habitable by 2031 is 5,000
iv. Average household size is 4.5