Portfolio Return At the beginning of the month, you owned $10,200 of company G, $10,300 of Company S, and $15,600 of Company N. The monthly returns for Company G, Company S, and Company N were 9.6 percent, -1.28 percent, and 9.3 percent. What is your portfolio return? a) 17.55% b)6.29% c)6.70% d)5.85%