# Total cost, revenue, profit

• Oct 27th 2010, 12:51 PM
Kristina
Total cost, revenue, profit
Hi guys,
Can you help me with my maths homework? Just find a way... Because I TOTAL do not understand what to do (Headbang) At least A variant (Worried)
http://www.part.lt/perziura/9b806ea9...a94b930563.png
http://www.part.lt/perziura/9b806ea9...a94b930563.png
• Oct 27th 2010, 03:05 PM
skeeter
(a) find $\frac{dC}{dQ}$ and minimize.

(b) profit = revenue - cost

find $\frac{dP}{dQ}$ and maximize.

http://www.part.lt/img/9b806ea9559c6...a94b930563.png
• Oct 28th 2010, 05:28 AM
Kristina
I still do not catch an idea how to calculate. Can you calculate A variant all. It will be much easer to understand. (Doh)
d(TC)/dQ=0
Q(square )-20Q+80=0
D=(-20) (square )-4*1*80=80