Cost analysis. A small company manufactures picnic tables.
The weekly fixed cost is $1,200 and the variable cost is $45
per table. Find the total weekly cost of producing x picnic
tables. How many picnic tables can be produced for a total
weekly cost of $4,800

Question

Cost analysis. A small company manufactures picnic tables. 
The weekly fixed cost is $1,200 and the variable cost is $45 
per table. Find the total weekly cost of producing x picnic 
tables. How many picnic tables can be produced for a total 
weekly cost of $4,800

aum · Answer

Total cost per week = fixed cost per week + variable cost per week.
C = 1200 + 45*x

For the second part set C = 4800 and solve for x.  If you get a decimal value for x round it down to the lower integer since x (that is, the number of tables) has to be a whole number.