The total cost of the Pet Starter Kit after the 5% sales tax is applied is $47.20.
The sum of the cost of the individual items is $47.73, before the tax is applied. Since the Mouse Chow is a food item, the total amount to be taxed is only $41.01. After applying the 5% sales tax and adding the cost of the Mouse Chow, the total cost of the individual items is $49.78.
Marco will save $2.58 by buying the Pet Starter Kit.