Which of the following is an example of a duopoly market?
a. boeing, airbus, and bombardier are the three aircraft manufacturing companies in the world.
b. debeers controls 70 percent of the market share in diamonds and the rest is shared by a few other companies.
c. the city of portland has three major cab service companies.
d. visa and mastercard exercise control over the electronic payment processing market in the world.

Biochemical corp. requires $600,000 in financing over the next three years. the firm can borrow the funds for three years at 10.80 percent interest per year. the ceo decides to do a forecast and predicts that if she utilizes short-term financing instead, she will pay 7.50 percent interest in the first year, 12.15 percent interest in the second year, and 8.25 percent interest in the third year. assume interest is paid in full at the end of each year. a)determine the total interest cost under each plan. a) long term fixed rate: b) short term fixed rate: b) which plan is less costly? a) long term fixed rate plan b) short term variable rate plan