We can do this by plugging n = 10,000 into the given equation:
C = 135,000 + 7.5n
C = 135,000 + 7.5(10,000)
Now, let's calculate the total cost:
C = 135,000 + 75,000
C = 210,000
So, the total cost of producing 10,000 textbooks is $\boxed{210,000}$.
B: Now,
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