Suppose mexico’s opportunity cost for producing 1 unit of food is 3 units of clothing and the united states’ opportunity cost for producing 1 unit of food is 0.5 units of clothing. trade at a ratio of 1: 1 is beneficial to both countries. how beneficial would it be for mexico if the trading ratio were 1 unit of clothing for every 2 units of food?
a. so long as the ratio is between 1: 3 and 2: 1, it makes no difference
b. mexico is better off not trading at all
c. this is even better than 1: 1
d. it is still beneficial, but not as good as 1: 1

John and daphne are saving for their daughter ellen's college education. ellen just turned 10 at (t = 0), and she will be entering college 8 years from now (at t = 8). college tuition and expenses at state u. are currently $14,500 a year, but they are expected to increase at a rate of 3.5% a year. ellen should graduate in 4 years--if she takes longer or wants to go to graduate school, she will be on her own. tuition and other costs will be due at the beginning of each school year (at t = 8, 9, 10, and 11).so far, john and daphne have accumulated $15,000 in their college savings account (at t = 0). their long-run financial plan is to add an additional $5,000 in each of the next 4 years (at t = 1, 2, 3, and 4). then they plan to make 3 equal annual contributions in each of the following years, t = 5, 6, and 7. they expect their investment account to earn 9%. how large must the annual payments at t = 5, 6, and 7 be to cover ellen's anticipated college costs? a. $1,965.21b. $2,068.64c. $2,177.51d. $2,292.12e. $2,412.76