50 000 x 10 = 500 000n (since we like this to be in newton)
now the
drag, we have a Lift/Drag ratio of 10 that is (1/10)
and we
only talk about a small climb angle this equals 500 000/10 = 50 000n
Thrust = 80 000 (20 000n x 4 engines)
Climb gradient = (Thrust -drag)/ weight X100
this
gives us the following:
((80 000 - 50 000) / 500 000 ) x 100 = 6
my
answer 6%