CFA Mock Q39 & Q42

are option premiums paid per contract or per share in the contract…for Q39 in the CFA mock exam i would have calculated the max profit as: (Ch-Cl) x 100 (as 100 contracts bought ad 100 contracts sold) + (Xh-Xl) x 10,000 (as 100 contracts bought each for 100 shares) pls explain where i’m going wrong as it’s meant to be: (Xh-Xl+Ch-Cl) x 100 to get the per contract profit and then x 100 to get the full profit for 100 contracts then on Q42 i assume from the answer that option contracts are always for 100 shares per contract although they didn’t explicitly mention it here as they multiplied by a further 100 than i would have done?