Gama industry has the amount of $ 600000 for investment at MARR= 15%. The manager of this company considered three different projects with rates of return as project 1 = 24%, project 2 = 18% and project 3= 30%). these projects have initial investments as $100,000 $ 300000, and $200000 respectively. The overall rate of return will be: Select one: 0 a. 0.45 0 b. 0.26 C. 0.23 d. 0.20