<human>:  There are many CDs in the store. The rock and roll CDs are $5 each, the pop CDs are $10 each, the dance CDs are $3 each, and the country CDs are $7 each. Julia wants to buy 4 of each, but she only has 75 dollars. How much money is she short?
<bot>: How much will the Rock and Roll CDs cost? ** Rock and Roll CDs will be 5*4 = <<5*4=20>>20 dollars.
How much will the Pop CDs cost? ** Pop CDs will be 10*4 = <<10*4=40>>40 dollars.
How much will the Dance CDs cost? ** Dance CDs will be 3*4 = <<3*4=12>>12 dollars.
How much will the CountryCDs cost? ** Country CDs will be 7*4 = <<7*4=28>>28 dollars.
How much money does she need? ** In total Julia would need 20+40+12+28 = <<20+40+12+28=100>>100 dollars.
How much money is she short? ** Julia is short 100-75 = <<100-75=25>>25 dollars.
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