Waves, Bungee Jumping, Linear Density Definition

Please look a picture.
I think the book made a mistake.
The answer should be 89.9N/m.
Why? Because they calculated the linear density μ wrongly. They should have done $$\frac{75*10^{-3}kg}{1.8m}$$

Attached Images
File Type: png Screen Shot 2014-06-13 at 6.23.35 PM.png (42.4 KB)


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