.25 Skill Builder Question Help ▼ The total cost function for a product is given by C(x)= 4x° -24x-256x+ 2136, where x is the number of units produced and C is the cost in hundreds of dollars. factoring by grouping and then find the number of units that will give a total cost of at least $60,000. Verify the conclusion with a graphing utility. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The values of x that make the total cost of at least $60,000 are the interval (Type your answer in interval notation.) O B. The values of x that make the total cost of at least $60,000 are the point(s) (Use a comma to separate answers as needed.) O C. There are no values of x that make the total cost of at least $60,000.

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