Most of the information's required for solving this question is already given. based on those information's the answer can be easily deduced.
Cost of producing 1 unit = $14
Selling price for 1 unit = $23
Fixed cost = $1200
Then
Cost C (x ) = 1200 + 14x
Revenue R (x ) = 23x
Profit P (x ) = 23x - 1200 - 14x
= 9x - 1200
I hope that the procedure is clear enough for you to understand and the answer has actually come to your desired help.