Mike has a mastercard with an annual fee of $25, an 18% interest, and a $1,000 credit limit. he always pays the total outstanding balance monthly. his most recent monthly statement lists last month's payment, new charges this month totaling $1,500, and a $30 fee. the fee is most likely the result of:
a. his annual fee.
b. transaction fees on purchases.
c. a late payment.
d. an over-the-limit fee.
e. interest charges.

One cost-of-living indicator available on the internet shows that a salary of $40,000 in santa barbara, california, is equivalent to $14,000 in wichita, kansas. this is primarily because of housing, which is much less expensive in wichita. what does this difference say about how the federal government calculates poverty?

2. how has taobao created economic opportunities for chinese entrepreneurs that were inaccessible to them before?

Because of the violent nature of the sport, professional american football players are at risk of suffering concussions (or brain injuries) during the violent collisions that occur between players during the game. violent collisions involving hits to the head are particularly risky. suppose the commissioner of the national football league (nfl) institutes a rule requiring players to wear a new, lighter helmet that is designed to reduce head trauma during collisions between players on the field. while the new helmets the probability of a concussion resulting from each individual collision, at the same time the new helmets could also give football players an incentive to play more , which could potentially the amount of violent collisions and thus the number of concussions suffered by nfl players, all else equal.