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An investment firm recommends that a client invest in bonds rated AAA, A, and B. The average yield on AAA bonds is 6%,on A bonds 7%,and on B bonds 10%. 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 $13,000,and the investor wants an annual return of $940on the three investments

B.The values in part A are changed to $22,000and $1,590,respectively

A.The client should invest $nothingin AAA bonds,$nothingin A bonds, and $nothingin B bonds.