Directions: Study the following data carefully and answer the question.
Directions: Study the following data carefully and answer the question.
Sales of books by a publisher (in thousands):
2019: 45, 2020: 60, 2021: 75, 2022: 50, 2023: 70
What is the average annual sale of books over the five years?
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Correct answer: (C) 60 thousand