Suppose the world price of cardboard is $60. Then, relative to the no-trade situation, international trade in cardboard

a. benefits Boxlandian consumers by $750 and harms Boxlandian producers by $660.
b. harms Boxlandian consumers by $736 and harms Boxlandian producers by $598.
c. harms Boxlandian consumers by $704 and benefits Boxlandian producers by $864.
d. harms Boxlandian consumers by $804 and benefits Boxlandian producers by $984.

Part (a) is relatively straight forward.there are 4 aces in a standard 52-card deck. so the probability that an ace is picked is just 4/52.part (b): note that there are 4 suits in a standard 52-card deck. so picking hearts will be 13/52 or 1/4.part (c): the probability condition or means we need to add the two probabilities because we do not want them simultaneously. so, we end up getting pr(ace) + pr(heart).from part (a), we found that picking an ace had a probability of 4/52, which is reduced down to 1/13.from part (b), we found that picking a heart had a probability of 1/4.so, the probability of an ace or a heart is 1/13 + 1/4 = 4/52 + 13/52 = 17/52.

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