Lea bought 2 shirts for 12.50 each. Multiply the cost of a single shirt by how many shirts Lea bought:

Add this value to the cost of the purse to find the cost of Lea's purchase before taxes:

Lea spent $75 before taxes.
To apply the tax, convert the sales tax from a percentage to a decimal:

Multiply this decimal by the total cost to find the sales tax:

Add this tax to the cost before taxes:

Lea spent
$80.25 in total.