Answer:
Option B - 1.8$
Explanation:
She gets skirt at 54$
Though she got discount = 30%
This clearly indicates that she safe 30% from her purchase,
Calculation,
54 * 30 / 100 = 16.20$
However, her friend told to get discount 1 / 3 of 54
This means 54 / 3 = 18
We subtract both discounts to each other like the following,
18 - 16.20 she will get more discount about 1.8$
Ultimately the answer would be B.