A firm pays its employees on the basis of work experience, if there are$5$ employees above $5$ years of experience,$7$ employees between $2.5$ to $5$ years of experience and $9$ employees below $2.5$years of experience, if these $9$ employees get $₹50000$ month and the other two slabs have an additional cap of ‘x’(for $2.5-5$ years experience employees) and ‘$2\mathrm{x}$’(for $> 5$ years experience) in addition to this $₹50000$, then the value of ‘x’ for which the median salary in the firm would exceed the mean salary by $₹8000$.