There are 4 quarters in a dollar so in quarters, each machine holds 80 quarters / 4 = $<<80/4=20>>20.
There are 10 dimes in a dollar so in dimes, each machine holds 100 dimes / 10 = $10.
Each machine therefore holds $20 in quarters + $10 in dimes = $<<20+10=30>>30.
So Erin must therefore have $90 total income / $30 income per machine = <<90/30=3>>3 machines.
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