The sales tax in don's county is 7.75%. a neighboring county has a
sales tax of 7.25%. how much will don save on a $399 computer
monitor if he purchases it in the neighboring county?

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.