# Can somebody explain this math to me?

So I was trying to calculate the jobcost for industry in a spreadsheet but I cant match it to ccp. Ingame for an example it gives me this.

However 0.0108 * 213965 = 2310.822 and NOT 2303 as shown in the screen shot. Is this a bug or am I missing something?

I expect it is a rounding error if the system calculates to more than 2 decimal points. 1.076% * 213965 = 2302.26 and that would round up to 1.08. I expect the â€śtrueâ€ť system cost index is between 1.076 and 1.077%

Its known as CCPround(). In that screenshot, the exact SCI (to 12 decimals) is 1.076344261912%. However, because CCP doesnt want people to easily calculate exactly whatâ€™s being built, they fuzz it a bit. It is also why itâ€™s not displaying isk cents on those totals. Personally Iâ€™d round up myself as well. Iâ€™d rather overestimate what costs would be, and not spend that much in reality, over underestimating and spending more.

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