Lance bought n notebooks that cost $0.75 each and p pens that cost $0.55 each. a 6.25% sales tax will be applied to the total cost. which expression represents but the total amount paid, included tax?

The total cost for n notebooks is 0.75n. Also, the total amount paid for the p pens is 0.55p. Adding them all up will give us an answer of,                                0.75n + 0.55p. 
Now, including the 6.25% tax, the total amount to be paid is,                       total amount  = 1.0625(0.75n + 0.55p)