Impressions
For each 100.000 digital impressions InBrowser ordered the advertiser gets 7% impressions for free. In this case it means that she gets 7000 impressions for free.
The unit count shows now that the customer has bought 240K impressions for a total revenue of 13200 €. This earns him 7% * 240000 = 16800 impressions.
A progressive calculation would only allow full batched of 100000 AI and show a total of 14000 earned units.
The total revenue applied is for both cases zero, as the rebate in kind give a way units for free.