Solve the problem.The sales in thousands of a new type of product are given by S(t) = 70 - 90e-0.8t, where t represents time in years. Find the rate of change of sales at the time when t = 6.
A. -8621.5 thousand per year
B. -0.6 thousand per year
C. 0.6 thousand per year
D. 8621.5 thousand per year
Answer: C
Mathematics
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