AC(x) =30,000 +3x / Xgives the average per unit cost, in dollars, for producing a small calculator.As the number of calculators produced gets very large, the average per unit cost will approach:

Select one:

A. $30,000/x

B. $3/x

C. $3x

D. $3

E. Can't be determined from the info given.

Theweekly profit of a custom surfboard manufacturer, indollars,is given by the quadraticfunction:P(x) =-4x²+ 400x-3600.Find the number of boards that will maximize weekly profit, and find the maximum weekly profit.

Select one:

A. 30 boards ; $4800 profit

B. 40 boards ; $6000 profit

C. 50 boards ; $6400 profit

D. 50 boards ; $26400 profit

E. None of the above.