Can anyone help with this 2 part question pls??

What has caroline's payment history been like? support your answer with two examples

Opportunity cost is calculated by which of the following? a. adding the value of all lost opportunities. b. subtracting all costs from the total benefit. c. calculating the cost of time, energy, and sacrifice. d. finding the value of the best option that is not chosen.

Suppose that two countries, britain and the u. s. produce just one good - beef. suppose that the price of beef in the u. s. is $2.80 per pound, and in britain it is £3.70 per pound. according to ppp theory, what should the $/£ spot exchange rate be? suppose the price of beef is expected to rise to $3.10 in the u. s. and to £4.65 in britain. what should be the one year forward $/£ exchange rate?