In a factory, there are 39 workers who have been categorized into five groups (A, B, C, D, E) on the basis of the range of their daily wages (in multiples of Rs.100). It is ensured that the daily wage of no worker is an exact multiple of Rs.100. The distribution is presented through the given histogram.

If two Managers are engaged to supervise the workers, with daily wages ranging between Rs.700 and Rs.800, then what will be the average daily wage (nearest to an Rs.) of all members of staff of the factory?