(advanced analysis) answer the question on the basis of the following information for a mixed open economy. the letters y, ca, ig, xn, g, and t stand for gdp, consumption, gross investment, net exports, government purchases, and net taxes respectively. figures are in billions of dollars. refer to the information. the equilibrium level of gdp for this economy is:

Aproperty title search firm is contemplating using online software to increase its search productivity. currently an average of 40 minutes is needed to do a title search. the researcher cost is $2 per minute. clients are charged a fee of $400. company a's software would reduce the average search time by 10 minutes, at a cost of $3.50 per search. company b's software would reduce the average search time by 12 minutes at a cost of $3.60 per search. which option would have the higher productivity in terms of revenue per dollar of input?