Biocompatability Rules question Options

[Rotbart van Dain...]

Actually it isn't mentioned in the FAQ at all. It was covered in the Augmentation Q&A thread:

And yes, if you get a Suite and get it Alpha and have Biocompatibility, the total cost should be 60% (a 10% reduction for the Suite, a 20% reduction for the Grade, and a 10% reduction for Biocompatibility). In general, when you have multiple things reducing the same Essence cost, they all reduce the same cost. You aren't getting a series of multiples, you're getting a discount of 10% (or whatever) of the original cost.

[Ravor]

Get a cybersuite for the eyes/ears, they are a common enough mod that suites should be offered. Also you'll probably want a datajack to go along with your commlink (Remember to carry an external sim-module if you actually want to use sim-sense.), which also should come with a suite.

Oh, and you'll want to save enough Essence for the pain Editor that you should be willing to sell your soul (and ass) to Bubba (the love troll) for. (IMG:style_emoticons/default/cyber.gif)

[Mäx]

And that is pretty much exactly what everyone else had said prior to your post stating we were wrong. The reduction is calculated before the two different types of implants are compared.

no it's not the same fortune, you cant just add up essence costs of alphaware implants and multiply it by 0.9, the math doesn't work like that.
you have to multiply the invidual essence cost by 0.7(alpha+biocomp) and then add them up. (IMG:style_emoticons/default/cyber.gif)

[nathanross]

Actually, not quite:

Option #2 calculates Implant Essence Cost x Alphaware x Biocompatibility - which is wrong.

It is Implant Essence Cost x (Alphaware + Biocompatibility). (IMG:style_emoticons/default/wink.gif)

Method 2) (.9 * .7 * 1/2) + .7 = 1.015 essence loss (the cyberware, after Biocompatability, is in less quantity so it only costs 1/2)

I just now realized that I misread/didnt consider that .72 could only be achieved through graded ware. I agree with you completely, as you are correct. What I was trying to clarify, is that post-chargen, essence loss is just (Essence Cost * Grade Modifier) if they did not purchase the Quality at Chargen or before they had the ware installed.

[Rotbart van Dain...]

Well, technically, there is no 'after chargen' for Biocompatibility. (IMG:style_emoticons/default/wink.gif)

[Fortune]

Actually, not quite

I was paying more attention to the order in which the calculations were done, since that was the crux of the question, and not the calculation themselves. (IMG:style_emoticons/default/smile.gif)

[pbangarth]

(a + b) * 0.9 = (a * 0.9) + (b * 0.9)

It doesn't matter whether you apply the biocompatibility individually for each implant or for the set of implants as a whole. It comes out to the same value. Why is there an argument here?

[Rotbart van Dain...]

Because Implant Essence Cost x Alphaware x Biocompatibility != Implant Essence Cost x (Alphaware + Biocompatibility)

[KCKitsune]

I would like to thank everyone who answered my question about this issue.

[jago668]

It ends up with a slight difference. For example

1 x .7 = .7
1 x .8 x .9 = .72

Had to edit the second one, put .7 in twice intead of .7 and .8

[pbangarth]

Because Implant Essence Cost x Alphaware x Biocompatibility != Implant Essence Cost x (Alphaware + Biocompatibility)

I concur with this statement, and agree that the right half of the inequation is the correct formula to apply.

From earlier posts I had the impression that you were arguing that there would be some different result if this formula were applied to each separate implant (and then adding the separate subtotals) from applying the formula once to the sum of the essence costs of multiple implants. This did not make sense to me. If I misread you, sorry.

[Rotbart van Dain...]

From earlier posts I had the impression that you were arguing that there would be some different result if this formula were applied to each separate implant (and then adding the separate subtotals) from applying the formula once to the sum of the essence costs of multiple implants.

Well that wasn't my point, but technically, that is the case as soon as there are rounding errors. (IMG:style_emoticons/default/wink.gif)

[pbangarth]

So don't round. ;o)