Answer:
To calculate the total sales tax for Carlotta Martinez's purchase, we need to add the state and county taxes. State tax = 5%County tax = 1.25%Total sales tax = State tax + County tax Let's calculate the state tax first. State tax = 5% of $399.99 = (5/100) x $399.99 = $19.9995 ≈ $20Now, let's calculate the county tax. County tax = 1.25% of $399.99 = (1.25/100) x $399.99 = $4.999875 ≈ $5Therefore, the total sales tax = $20 + $5 = $25.So, the total sales tax for Carlotta Martinez's purchase is $25.