A cyclist must decide between purchasing a new helmet for about $60 or a set of aerobars for about $120. If she decides to purchase the aerobars, what is the opportunity cost?
A. The net value to the cyclist of the helmet.
B. The difference in price of $60.
C. The net value to the cyclist of $60 and a new helmet.
D. The net value to the cyclist of the new aerobars.

$1,240 is the answer! ~ hope i !

The correct answer is (b) the marginal contribution of labor decreases as the quantity of labor used in production increases;

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.