Consider a two-period model in which the consumer chooses consumption today (c), consumption tomorrow (c') and savings (s > 0) or borrowing (s < 0) to solve the problem below. maxU(c,c') subject to: c + s = y and c' = y' + (1+r)*s Let y = 5.1 and y' = 7.8. Let the net interest rate be r = 4 percent. Keeping in mind that the slope of the budget constraint is negative, answer the questions in parts a) and b). For part a) report 2 decimal places. a). The slope of the lifetime budget constraint of the consumer is b). If the net interest rate increases, the budget constraint A. becomes flatter B. becomes steeper C. remains unchanged