Consider input-output model: input matrix: a= r 0.05 0.33 0.19 0.25 0.10 0.38 0.34 1 0.12 0 final-demand vector: d= r 1800 200 900 1) explain economic meaning of the elements 0.25, 0, and 900. (3 points) 2) explain the economic meaning of the second-column sum. (3 points) 3) write out the specific input-output matrix equation for this model. (2 points) 4) solve the model by any method. (8 points) 5) describe in words what your solution mean. (4 points) 6) write out comparative-static derivatives in the form of 7.23" on page 174 in the textbook. (2 points) 7) what does the partial derivative of xı with respect to d2 mean? (2 points)

Croy inc. has the following projected sales for the next five months: month sales in units april 3,850 may 3,875 june 4,260 july 4,135 august 3,590 croy’s finished goods inventory policy is to have 60 percent of the next month’s sales on hand at the end of each month. direct material costs $2.50 per pound, and each unit requires 2 pounds. raw materials inventory policy is to have 50 percent of the next month’s production needs on hand at the end of each month. raw materials on hand at march 31 totaled 3,741 pounds. 1. determine budgeted production for april, may, and june. 2. determine the budgeted cost of materials purchased for april, may, and june. (round your answers to 2 decimal places.)