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To find out how much change Dani should get, we first need to calculate the total cost of the meals for her and her friends.
The total cost is the sum of Dani's meal and her friends' meals: $5.72 + $4.89 + $7.30 = $<<5.72+4.89+7.30=17.91>>17.91.
Next, we need to subtract the total cost from the amount Dani paid with her $20 dollar bill: $20 - $17.91 = $<<20-17.91=2.09>>2.09.
Therefore, Dani should get $2.09 in change.