Alma bought a laptop computer at a store that gave a 20 percent discount off its original price. The total amount she paid to the cashier was p dollars, including an 8 percent sales tax on the discounted price. Which of the following represents the original price of the computer in terms of p?

original -.20 * original = sales price

original (1-.2) = sales price

original*.8 = sales price

total amount = sales price + sales price*.08

total amount = sales price + sales price*.08

total amount = sales price (1+.08)

total amount = sales price (1.08)

replace original price with p

.8 p = sales price

total amount =.8p (1.08)

total amount =.864p