Final answer:
The total amount paid by Shaniece, including a 4% tax and a 21% tip on the entire bill (including tax), can be represented by the expression 1.2584xx.
Step-by-step explanation:
To calculate the total amount Shaniece paid at the restaurant including tax and tip, we need to first calculate the tax added to the subtotal and then determine the tip based on the total after tax.
First, we find the tax amount by multiplying the subtotal (xx dollars) by the tax rate (4%). As a decimal, 4% is 0.04, so the tax amount is 0.04xx.
The new subtotal including tax is the original subtotal plus the tax: xx + 0.04xx, which simplifies to 1.04xx.
Next, Shaniece leaves a 21% tip on the entire bill after tax. To find the tip amount, we convert 21% to a decimal (0.21) and multiply it by the new subtotal including tax. This gives us 0.21 × 1.04xx, which simplifies to 0.2184xx.
The total amount paid by Shaniece is the subtotal including tax plus the tip: 1.04xx + 0.2184xx.
Simplified, the expression representing the entire amount paid is 1.2584xx.