Question: Getting maple to choose optimum value


I have this problem regarding how many employees (the variable x) is needed to get the lowest wage cost in a company. I have written the following model:








I already know that the wage will be the lowest if x=>9. What i want to do is to get Maple to tell me that x should be exaclty nine. I tried with minimize and optimize and a bit of programming, but with no luck. I can't figure out how to make maple do this so any help would be appreciated!

Best regards


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