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I am trying to do this manually without excel, http://office.microsoft.com/en-us/help/HA100242441033.aspx [Broken]

I have come to the two equations:

u=30000*(1+((x/20)-1)*-1.1)

m=(u*(x-10))-300000

where u= optimum units sold

x= optimum price

m=margin with optimum price

I have tried simplifying these together and optimising it, but keep getting the wrong answer. Could anyone help me by providing a solution to it which matches the one on microsoft's website?

Thanks

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# Can't solve problem

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