you are selling a product on commission, at the rate of $1,000 per sale. to date you have spent $800 promoting a particular prospective sale. you are confident you can complete this sale with an added expenditure of some undetermined amount. what is the maximum amount, over and above what you have alredy spent, that you should be willing to spend to assure the sale?there is no minimal amount...this is the question on page 284 this is the problem #6 page 284 from the book Analysis for financial management" Robert . Higgins eleventh edetion.