QUESTION 7 10 point Calculate the incremental benefit-cost ratio based on the alternatives below. You need to account for the time value of money using an interest rate of 5% (Hintmake use of slide 8 in powerpoint presentation titled 'ECON-401-CH-08-09-10'). Year Alt A Alt B -$15,000 $7,500 $7,500 $7,500 -$10,000 $5,000 $5,000 S6.500