An investment firm recommends that a client invest in bonds rated aaa, a, and b. the average yield on aaa bonds is 5%, on a bonds 7%, and on b bonds 12%. the client wants to invest twice as much in aaa bonds as in b bonds. how much should be invested in each type of bond under the following conditions? a. the total investment is $28 comma 000, and the investor wants an annual return of $2 comma 020 on the three investments. b. the values in part a are changed to $35 comma 000 and $2 comma 530, respectively.