Your total restaurant bill is the items you have purchased
plus the sales tax and plus the tip (if there’s any). Sales tax is added to
your purchase because this is tax imposed to the consumer and not to the buyer.
The buyer is only required to collect this tax from the buyer.
Second question:
A check is a financial instrument wherein the bank is
required to pay when presented or encashed to them. You just have to make sure
that you have account balance to that certain bank.
Third question:
The way of payment not any more common in the most modern
economies is the bartering. Both credit cards and cash are the most common way
of paying for your purchases.
