Formula Question

[igotnomilk]

So I am going through the game mechanics - writing a simple province simulator code for elf/sage.

I have a problem with this bit in percentage-based building effect calculation:

Percentage Based Buildings = Base Effect * BE * % of building * (100% - % of building)


Taken from the guide (Under 'Building Effects')

Take the case of banks for example. Base effect is 1.25%.
So if I have: 100% BE and 22.6% Banks,

Percentage based building effects = 1.0125*1.00*0.226*(1 - 0.226) = 0.1771
i.e. 17.7% higher income

But province reports for the same numbers give me:

Produce 2,575 gold coins per day
21.89% higher income (0.67%)

I do have 7.8% alchemy science, but that can't have factored into the calculation of building effects.

What am I doing wrong?

[Palem]

Take the case of banks for example. Base effect is 1.25%.
So if I have: 100% BE and 22.6% Banks,

Percentage based building effects = 1.0125*1.00*0.226*(1 - 0.226) = 0.1771
i.e. 17.7% higher income

But province reports for the same numbers give me:

Produce 2,575 gold coins per day
21.89% higher income (0.67)

Bolded the mistake. Underlined the correction below.

1.25*.226*(1-.226)=.218655

The slight difference shown is prolly a rounding error on the information provided to you (i.e. your BE might be like 99.9, but rounded to 100)

[igotnomilk]

Cheers Palem. I always thought percentages were converted to decimal form in utopian formulae.

[Palem]

It's calculating the bonus, not the overall effect.