A Question about Hypothesis Testing

[Artusartos]

In this link:

http://www.math.harvard.edu/~phorn/362/362assn3-solns.pdf

Why isn't the significane level for number 5 just 0.01? Because we know that if the mean is 30,000 (the same as the mean for the null hypothesis), the value of the power function is 0.01...

Thanks in advance

 

[mfb]

Are you sure you added the correct link? I cannot see 30,000 or 0.01 anywhere at problem 5 (or anywhere else).