well, i'm guessing you don't want to choose, am i right?
is there any way you can dance on different day or go to work on a different day, or atleast trade shifts for your job?
this is the best advice i can give you, unless you want to choose between dance or work (personally, i would choose work, as much as i love dance. you could use the money to pay for even more dance classes so it wouldnt really bother me! =])
hope i helped. good luck