The total sales of S (in thousands of DVD's) of a certain movie are given by the following formula where t is the number of months since the release of the DVD. Use the formula to answer the questions. 8012 S(t) = 12 + 150 a) Find S'(t). S'(t) =+ The total cost (in hundreds of dollars) of producing x calculators per day is given by the 20- .equation. 15- Cost (hundred dollars) C(x) =6+ 12x +48 OSX S 50 X Perform the following calculations and interpret the results. 10 20 30 40 50 Production C'(X) =