IBPS Clerk Mains 2018 Paper

The average of total employee left company BIM in the given three years is 21 and ratio of employee left in 2015 to in 2017 is 7 : 6. If company BIM starts in 2015, then find total employee working in BIM at the end of 2016 is what percent more than total employee who joined company DWF in the year 2016?