Spice Airline has a free luggage allowance of f kg.
If any passenger carries excess luggage, it is
charged at a constant rate per kg. The total luggage
charge paid by two passengers Mohan and Sohan is
₹1050. If each of Mohan and Sohan had carried
twice the luggage he actually did, their luggage
charges would have been ₹2400 and ₹900
respectively. Find Mohan's luggage charge.(in ₹)