Question 25817
Let x be the $ 2 increase.
cost of DVD:
2(x+40)
2x+80
DVD sold = 6000-200x
(2x+80)(6000-200x)
-400x^2+12000x+480000-16000x
-400x^2-4000x+480000
400x^2+4000x-480000=0,x
x^2+40x-1200=0
CAN YOU SOLVE IT FROM ZTHERE if not e-mail me back.
you'll get x=30
Hence, the revenue is 30.
PAUL.