Answer:
C. $1.80
Step-by-step explanation:
Given:
MSRP of a certain item = $60
Percentage of Selling by store A = 20%
Percentage amount will be = 
Sales tax = 5% on purchase price
Amount of sales tax = 
Total Cost of item at Store A is MSRP of a certain item plus Percentage amount of selling the item plus Amount of Sales tax.
framing in equation form we get;
Total Cost of item at Store A = 
Also Given:
Percentage of Selling by store B = 30%
Percentage amount will be = 
Regular price of item at store B = 
Percentage of discount of item at store B = 10% on regular price
Amount of discounted item at store B = 
Now regular price of item with discount at store B will be equal to Regular price of item at store B minus Amount of discounted item.
regular price of item with discount at store B = 
Sales tax = 5% on purchase price
Amount of sales tax = 
Total Cost of item at Store B is regular price of item with discount at store B plus Amount of Sales tax.
framing in equation form we get;
Total Cost of item at Store B = 
The result when total cost of the item at Store B is subtracted from the total cost of the item at Store A = $73.2 - $75 = $1.80.
Hence the result is $1.80.