The cost to produce one compact disc is $1.25 plus a one time fixed cost of 3000. The revenue recieved from selling one compact disc is $11.

Write a formula that gives the cost C of producing x compact disc. Be sure to include the fixed cost.
Write a formula the gives the revenue R from selling x compact discs.
Profit equals value minus cost. Write a formula the calculates the profit P from selling x compact discs.
How many compact disc need to be sold to yield a positive profit?

Question

The cost to produce one compact disc is $1.25 plus a one time fixed cost of 3000. The revenue recieved from selling one compact disc is $11.

Write a formula that gives the cost C of producing x compact disc.  Be sure to include the fixed cost.
Write a formula the gives the revenue R from selling x compact discs.
Profit equals value minus cost.  Write a formula the calculates the profit P from selling x compact discs.
How many compact disc need to be sold to yield a positive profit?