A company manufactures x calculators weekly that can be sold

[diedead]

I attempted this problem....but i think i set it up wrong so i got stuck..
please help me, thanks to everyone

A company manufactures x calculators weekly that can be sold for 75 - 0.001x dollars each, at a cost of 1850 + 28x - (x^2) + 0.001x^3 dollars for manufacturing x calculators. The number of calculators the company should manufacture weekly in order to masimize its weekly profit is...?

What I did:

well i thought taht the first equation minus second was the profit...
x(75-.01x) - x(1850+28x-(x^2)+.001x^3)
.........................(algebra)
(max)'=-4x^3+3000x^2-56020-1925000
=x^3-750X^32+14005x+481250
thanks again guys

 

[stapel]

Why are you multiplying the cost of "x" calculators by "x"?

Eliz.

 

[diedead]

then how do u do it.....

i am totally stuck

 

[tkhunny]

Read the problem statement carefully. If you have a unit price, multiply by the number of units to obtain the total price. If you have total price, don't multiply by the number of units again.