Solve the problem.For the total-revenue functionR(x) = 3x,find ?R and R'(x) when x = 50 and ?x = 1.
A. ?R = $1.50; R'(50) = $1.50
B. ?R = $6.00; R'(50) = $3.00
C. ?R = $3.00; R'(50) = $3.00
D. ?R = $6.00; R'(50) = $6.00
Answer: C
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