that promo # is likely the wrong one tho, it seems like the 50% promo code. using the one bonus as 10% it seems he changed most values to 26 and then 10% and i have no idea. lol. i was just like cool bro thanks. i did nothing but give him the games this morning and he has no idea about flipping but said he saw the 50% sign and asked to get it but knew the values were gonna be higher than 120. no idea but we both won out. lol
Yep, it is the 50% code.
Here's the deal for NFS:MW 2012 in any case.
Base value = $17. He added $18 for some reason. I guess he failed at math because that would make it $35 which isn't right for either the bonus promo or
the 50% extra, unless maybe he was trying to do both
Then both the 50% promo and PUR got applied on the new override total value of $35.
So base ($17) + override ($18) + 50% promo (0.5 * $35) + PUR Pro (0.1 * $35) = $56.
It would have been complicated to get it to work out, but even with the (normally not allowed) promo stacking you should have gotten $17 + $13 (bonus value) + $8.50 (50% of base) + $1.70 (10% of base) = $40.20. But whatever - you got seriously lucky!
A long time ago (like when the PS3 and Wii first came out) I knew a store manager who stacked promos for me. While I never got anything that outrageous, it was always complicated to work it out exactly and I'd come out ahead no matter what he did for the same reason: overrides to the base value stack with promos. He tried to put in less of an override to make up for it, but never quite got it right.