thank you, come again?

as i do before every final exam period, i stopped into dunkin donuts today. normally i get a few donuts and a large coffee, and i'm on my way. but this time, i came for the bags of coffee so that i could brew it myself at home.

the only 2 people i've ever seen working at this particular dd are this indian man and woman. they also usually hook me up with an extra donut or something. well, i got a half dozen donuts and a bag of coffee, and they said something about $5 off. but they have very thick accents and it's hard to understand what they're saying. for a minute i thought i was there about my dell (which sucks by the way). then the woman pointed to the bag of coffee i already had, and motioned for me to get another. so i got another and put it on the counter. she smiled and nodded. then she rang me up and said "see, $10.50." i dont know what $10.50 meant or where it came from, since the coffee was $7.99 lb (each bag being a pound). i guess it was $5.50 off, and that's what she meant. plus, the total was like $15. so i have no clue. i think i got a deal?