In: Finance
A trust officer at the Blacksburg National Bank needs to determine how to invest $150,000 in the following collection of bonds to maximize the annual return.
| 
 Bond  | 
 Annual Return  | 
 Maturity  | 
 Risk  | 
 Tax Free  | 
| 
 A  | 
 9.5%  | 
 Long  | 
 High  | 
 Yes  | 
| 
 B  | 
 8.0%  | 
 Short  | 
 Low  | 
 Yes  | 
| 
 C  | 
 9.0%  | 
 Long  | 
 Low  | 
 No  | 
| 
 D  | 
 9.0%  | 
 Long  | 
 High  | 
 Yes  | 
| 
 E  | 
 9.0%  | 
 Short  | 
 High  | 
 No  | 
PLEASE SHOW STEP BY STEP spreadsheet models and solver.
The officer wants to invest at least 40% of the money in short-term issues and no more than 20% in high-risk issues. At least 25% of the funds should go in tax-free investments, and at least 45% of the total annual return should be tax free.
The LP spreadsheet model is built as below :


This is solved using Solver as below :

The solver solution is below :

This solution maximizes annual return subject to the given constraints