Why does the Bkan 1C take 110k rp to research?

I was wondering why the Bkan 1C was 110k and all of the other tier 4 vehicles are less. The Bkan is 6.7 yet the strv 81 and Ikv 91 are 7.7 but only need 82k to research. The charioteer is also at the same BR bracket (its 6.3) yet only need 63k to research. All of this really confuses me, does anyone have any answers?

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