Based on the information given the amount she could have saved at the store her friend suggested is $1. 80.
First step is to calculate the discount
Discount=30%×$54
Discount=$16.20
Second step is to calculate the amount saved
Amount saved=(1/3×$54)-$16.20
Amount saved=$18-$16.20
Amount saved=$1.80
Inconclusion the amount she could have saved at the store her friend suggested is $1. 80.
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