Is There an Error in Morris Kline's Book?

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Morris Kline's book contains a passage that prompted a calculation regarding a financial scenario. The initial calculations presented were questioned for accuracy, leading to confusion about a potential error in the text. Upon further review, the poster realized they had overlooked a crucial detail regarding an annual amount of $1800. This oversight clarified the misunderstanding, suggesting that the initial concern about an error was unfounded. The discussion highlights the importance of careful reading in mathematical contexts.
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Hi,

I was just reading a passage from a book by Morris Kline and he states the following:

http://img443.imageshack.us/img443/3684/kline.jpg

For the first job, I calculated the following:
900 900 1100 1100 1300 1300 1500 1500
Have I misunderstood him, or is this an error on his behalf?
 
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Ignore thread. I overlooked the $1800 per year part.
 

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