Example: a discount of $50 off the purchase of a camera lens (otherwise regularly priced at $100) when purchased with a camera (priced individually at $900) would be applied on a cost-weighted basis against all of the items purchased as part of the offer as follows: (a) the camera lens's cost-weighted discount would be $50 x ($100/($900+$100)), or $5 off of $100, for a discounted price of $95; (b) the camera's cost-weighted discount would be $50 x ($900/($900+$100)), or $45 off of $900, for a discounted price of $855.
Example: an offer of "Get 1 free when you buy 4 or more" on the purchase of four video games (otherwise priced individually at $20 each) would be applied as follows: (a) the cost-weighted discount for each video game would be $20 x ($20/($20 + $20 + $20 +$20)), or $5, for a discounted price of $15 for each video game; (b) the total discount on all four games would be $20, which equates to the individual undiscounted price of one of the games. Where the offer advertises a "free" item but the items in the offer vary in price, the total discount applied equals the undiscounted individual price of the least expensive item in the offer, which is distributed on a cost-weighted basis to each of the items purchased as part of the offer.