Information on four investment proposals is given below: ME Proposal Investment Net Present Value 1 $50,000 $30,000 2 $60,000 $24,000 3 $30,000 $15,000 $ 9,000 $45,000 4 What are preference rankings of the four proposals according to the profitability index? Select one: 3.4.1.2 1.2.3.4 O 1,3,2, 4 2, 1, 4, 3