Okay so the equation. Lets say e is explorers and v is flying vs and m = money.
e + v > or = 30.
80e + 5v =m.
e < or = 20\ v < or = 20. Okay, the most money he could make would be if he made 20 explorers at 80 dollars and 10 vs at 5 dollars. Total money... 1600 + 50 = 1650. So he could make $1650.
