delta lighting has 30,000 shares of common stock outstanding at a market price of $15 a share. this stock was originally issued at $31 per share. the firm also has a bond issue outstanding with a total face value of $280,000 which is selling for 86 percent of par. the cost of equity is 13 percent while the aftertax cost of debt is 6.9 percent. the firm has a beta of 1.48 and a tax rate of 30 percent. what is the weighted average cost of capital?

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?