A flexible rope weighing 1.5 kN/m spans between two points 50m apart and at the same level,15 m above the ground. The rope is required to carry a concentrated load of 400 kN at a point P on the rope which is to be at a horizontal distance of 20 m from the left end support. Calculate the maximum height(in m) above the ground to which the point P may be raised if the maximum tension in the rope is not to exceed 1500 kN. Assume the distances measured along the rope are equal to their horizontal projection on the ground.