Let X be the number of energy drinks sold.
The manufacturer of an energy drink spends $1.20 to make each drink and sells them for two dollars the manufacturer also has fixed cost each month of $8000.
The manufacturing cost for X energy drinks is
[tex]1.20x[/tex]Fixed cost is $8000.
Therefore, cost function is
[tex]C(x)=1.20x+8000[/tex]Selling price of each drink is $2.
Therefore, the revenue function is
[tex]R(x)=2x[/tex]Hence, the revenue function is
[tex]R(x)=2x[/tex]