A shopper paid $51.93 including tax for an item marked $48.99 what would she pay for another item marked $75?

Amount of money paid by the shopper including tax = $51.93

Actual cost of the item = $48.99

Then

Amount of tax paid = (51.93 - 48.99) dollars

= 2.94 dollars

So

Percentage of tax taken = (2.94/48.99) * 100

= 294/48.99

= 6.00 percent

Cost of another item = $75

percentage of tax to be given = 6%

Amount of tax to be paid = (6/100) * 75

= 450/100 dollars

= 4.5 dollars

So

The total payment for the item costing $75 is = (75 + 4.5) dollars

= 79.5 dollars

So $79.5 needs to be paid by her for the item priced $75.