<em><u>Since the rate of the other store is not given, let us just get the sales price of the skirt Dima bought from the discount store.</u></em>
<em><u></u></em>
<em><u>Original price : $54</u></em>
<em><u>Discount rate : 30%</u></em>
<em><u></u></em>
<em><u>$54 x 30% = $16.20 value of the discount</u></em>
<em><u>$54 - 16.20 = $37.80 discounted price.</u></em>
<em><u></u></em>
<em><u>Since Dima's friend told her she could have had a better deal at a different store, this means that the discount rate is higher than 30%. Let us assume that the discount is 35%</u></em>
<em><u></u></em>
<em><u>$54 x 35% = $18.90 value of the discount</u></em>
<em><u>$54 - 18.90 = $35.10 discounted price.</u></em>
<em><u></u></em>
<em><u>Discount store: $37.80</u></em>
<em><u>Different store: $35.10</u></em>
<em><u></u></em>
<em><u>Different store sales price is cheaper by $2.70</u></em>