How is the total price including sales tax calculated?a: (purchase price) x (percent sales tax); then added to original amountb: (purchase price) x (percent sales tax); then subtracted from original amountc: (purchase price) x (percent sales tax); then divided by the original amountd: (purchase price) x (percent sales tax); then multiplied by the original amount

Answer:a: (purchase price) x (percent sales tax); then added to original amount .Step-by-step explanation:The total price including sales tax is always calculated by adding the sales tax to the original price.Example:A book costs $100 with a sales tax of 10%.The price of the book without sales tax is just $100. We then compute for the sales tax by multiplying the original price to the sales tax percentage.100 x 10% or 0.1 = $10.The sales tax will be 10.Then we add the sales tax with the original price of $100.$100 + $10 = $110 Total price after sales tax.