Calculating unit costs

[Nikodil]

I'm trying to understand the formula for how upgrades affects unit cost.
Some units seem to use the exponential expression
unit_cost = base_cost * 1.7^v * 1.33^w * 1.38^a
Others seem to use some kind of polynomical calculation, very wierd. Anyone know exactly what magic is behind all this?

[CBR]

Missile units have a reduction in cost(based on what missile weapon it uses) before the unit_cost = base_cost * 1.7^v * 1.33^w * 1.38^a

Another thread with info:

link (http://www.totalwar.org/cgi-bin/forum/ikonboard.cgi?act=ST;f=5;t=9437)

CBR