Sure. I'm just going to pull numbers out of my a**, since I don't have anything concrete in front of me ATM.
EDIT:
INCORRECT. See posts below.
For a certain setting, I decide to make Weapon A my baseline piece of equipment. The build for Weapon A comes to 40 Active Points and 10 Real Cost. I want Weapon A to have a base cost of 10 Silver Marks (SM). For other equipment, I want each +20 Active Points to double the cost of the equipment, and I want each +5 Real Cost to double the cost of the equipment (note that if a piece of equipment goes up by
both +20 AP and +5 RC, its price will be quadrupled--doubled once for each). So:
M = 10 SM
B = 40*10 = 400
C = 20*5 = 100
This makes the equation for the base equipment cost:
base cost = (10 SM)*2^[(A*R - 400)/100]
Now to determine the price of Item B, which happens to be built with 38 Active Points and a 3 Real Cost, I use:
(10 SM)*2^[(38*3-400)/100] = (10 SM)*2^[(114-400)/100] = (10 SM)*2^(-286/100) = (10 SM)*2^-2.86 ~= (10 SM)*0.138 = 1.38 SM ~= 1.4 SM
To determine the price of Item C, which happens to be built with 38 Active Points and a 11 Real Cost, I use:
(10 SM)*2^[(38*11-400)/100] = (10 SM)*2^[(418-400)/100] = (10 SM)*2^(18/100) = (10 SM)*2^0.18 ~= (10 SM)*1.13 = 11.3 SM ~= 11 SM
To determine the price of Item D, which happens to be built with 48 Active Points and a 17 Real Cost, I use:
(10 SM)*2^[(48*17-400)/100] = (10 SM)*2^[(816-400)/100] = (10 SM)*2^(416/100) = (10 SM)*2^4.16 ~= (10 SM)*17.9 = 179 SM ~= 180 SM
This makes costs exponential with respect to Active Points and Real Cost, BTW, which will actually happen to translate in a sense to real Character Points in the Money Perk (just a lot finer grained than rounding off to full Character Point values using a straight multiple). It means something that gives a relative benefit in combat might very well be significantly more expensive. If you don't like this, you can change the divider (C) to double the price a lot less quickly, or you can go with a non-exponential relationship like simply:
base cost = M*(A*R-B)/C
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