Answer:
1/2 or 0.5 dollars per kg of apples
The first thing to do is to find out how much a kg of apples sells for, since the question is only asking for the selling amount of a single kg. Nothing else. Each trip gets 300 dollars and delivers fifty packs. So each Pack, or P = 300/50, or P = 6 dollars
And each pack contains 12 kg of apples, so if P = 6 dollars and P = 12 kg of apples, then 6 dollars = 12 kg of apples
then 1 kg apples = 6/12, or 1/2.
So a single Kg of apples cost 0.5 dollars