Answer:
She will pay $30.8448.
Explanation:
Consider the provided information.
The price of the sweater is $90.
She gets a discount of 30% it means she needs to pay only (100-30)%=70% of $90.
70% of $90 =
Now she gets a discount of 20% it means she needs to only 80% of $63.
If she gets a discount of 10% on $50.4 it means she needs to pay 90% of 50.4
If she gets a discount of 15% on 45.36 it means she needs to pay only 85% of 45.36
Now she gets an additional 20% holiday Bones Buck discount it means she needs to pay 80% of 38.556
Hence, she will pay $30.8448.