Question 109284:  greatly appreciate your help on this question - thank you 
Determine the revenue function:  a company has found that if they produce x units of a product, they must sell them each at $10 - 0.2x if they are to sell them all. 
 would revenue function be  R(x) = P*q = (10 - 0.2x)*x
 
and also, their fixed costs are $40 and their Variable costs per unit are $1 Determine the cost and profit functions 
Functions are cost = 1(x) + 40 ? 
Profit function = total revenue - total cost 
                = -0.2x^2 + 9x + 40 ? 
Am I at all close? 
 Answer by stanbon(75887)      (Show Source): 
You can  put this solution on YOUR website! Determine the revenue function: a company has found that if they produce x units of a product, they must sell them each at $10 - 0.2x if they are to sell them all. 
would revenue function be R(x) = P*q = (10 - 0.2x)*x 
Yes, that is correct for the Revenue equation. 
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and also, their fixed costs are $40 and their Variable costs per unit are $1 Determine the cost and profit functions 
Functions are cost = 1(x) + 40 ? 
Yes, that is correct for the Cost equation. 
---------------------- 
Profit function = total revenue - total cost 
10x-0.2x^2 = x+40 
-0.2x^2+9x-40=0 
Rearrange: 
0.2x^2-9x+40=0 
Multiply thru by 5 to get rid of the decimal: 
x^2 - 45x + 200 = 0 
x = [45 +- sqrt(45^2-4*200)]/2 
x = [45 +- 35]/2 
x = 40 or x = 5 
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Cheers, 
Stan H.
 
 
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