This breach of contract action determined that plaintiff is entitled to prejudgment interest on money paid under the contract during a pending collection suit, even though that payment is not included in the principal amount of the subsequent judgment. For purposes of determining cost-shifting under NRCP 68(g) and NRS 17.115(5), the court concluded that pre-offer prejudgment interest must be computed on payments made during the pendency of the suit and added to the actual judgment when it is compared to the offer of judgment despite the offer’s silence on the inclusion of interest.