12
--------------------------
$849-20%=$679
$679+6%(sales tax)=$719
$719 is the total cost of the tv
I'm just estimating here,
5/48,3/16,0.5,0.75
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

Fixed cost is $8000.
Therefore, cost function is

Selling price of each drink is $2.
Therefore, the revenue function is

Hence, the revenue function is