No claim for extra compensation on account of changed or added work may be made by the Sub-Contractor unless such changed or added work was authorized in writing by the Contractor prior to the commencement thereof. Fort Dodge Asphalt argues this language calls for the payment of fair and reasonable compensation for the work added. Pauline cites no legal authority to support its position. Failure in the brief to cite authority in support of an issue may be deemed waiver of that issue. Iowa R. App.
Substantial evidence supports the district court's findings of fact.
Pauline's own expert witness testified some government entities allow a change in unit price if there is a substantial increase or decrease in quantity. For example, the expert testified, the Department of Transportation renegotiates the unit price if the quantity increases or decreases by twenty-five percent. The district court did not err in refusing to compensate Pauline on a per-unit basis.