Let the fixed cost and variable cost paid by the company be Rs. 'F' and be Rs. 'V', respectively.
ATQ;
F + 100V = 2500 X 100 + 1000 X 100
Or, F + 100V = 250000 + 100000
Or, F + 100V = 350000...... (I)
Also,
F + 400V = 2500 X 400 - 500 X 400
Or, F + 400V = 1000000 – 200000
Or, F + 400V = 8, 00,000..... (II)
On subtracting equation (I) from equation (II), we have;
300V = 4, 50,000
Or, V = 1500
On, putting V = 1500 in equation (I), we have;
F + 100 X 1500 = 350000
Or, F = 2, 00,000
So, profit earned when 600 passengers aboard the cruise = 2500 X 600 -(200000 + 600 X 1500) = 1500000 - 1100000 = Rs. 4, 00,000
So, the correct option is (C): Rs. 4, 00,000.