Day 1 - Just do normal jump should get $17
Day 2 - Buy 1 accelerator and get the distance challenge - should get $52
Day 3 - Buy the Hang glider - get Height + Time challenge - this unlocks 10' ramp - approx $100.
Day 4 - Buy 2x Acceleration 1x Ramp height and 1x Drag - get speed challenge on 5' ramp.
Day 5 - Buy 3x Height 1x Drag - get Height + Time on 10' ramp.
Day 6 - Buy Rocket + 2 Fuel - Do Height + Time on 20' ramp.
Day 7 - Buy 2nd Glider - do speed + distance on 10' ramp.
Ok, that's all you get because,
a) That's half-way there and I don't won't you to beat my score

, and
b) I can't remember what I did after day 7.
Oh, and you can do the last 6000ft challenge without 1x Ramp Height and 3x Drag (maybe even with less but i'm not sure - it's all in the technique you see

)