Financial manager wants to decide whether to replace the old machine with a new one. Use the following data to calculate the marginal benefit and the marginal cost respectively Cost of new machine =$8000; Selling price of old machine = $2,000; Benefits of new machine = $10,000; Benefits from old machine = $3,000 Select one: a. $6,000 and -$7,000, respectively b. $7,000 and $6,000, respectively c. $7,000 and -$3,000, respectively d. $3,000 and $7,000, respectively