31Furthermore, the Commission fulfils its obligation to state reasons when it sets out, in its decision, the factors which enabled it to determine the gravity of the infringement and its duration (judgment of 22 October 2015, AC-Treuhand v Commission, C‑194/14 P, EU:C:2015:717, paragraph 68). Although it is not required to provide all of the figures relating to each of the intermediate steps relating to the method of calculation, it is nevertheless incumbent on it, as the General Court found in paragraph 291 of the judgment under appeal, to explain the weighting and assessment of the factors taken into account (judgment of 8 December 2011, Chalkor v Commission, C‑386/10 P, EU:C:2011:815, paragraph 61).
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